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I designed this hovertank for my Astral Republic faction a while back: a hovertank with a flotation hull. No fluff yet, but the idea is that it's basically an Amphibious Assault Vehicle, riverine or coastal patrol craft, and so forth. It has the mobility of a hovercraft, with the flexibility of a flotation hull for operation over water. The BV and cost aren't quite right because HM Vee doesn't have an option for flotation hulls yet. I decided to post this to see what y'all think of it.

NOTE: I house rule flotation hulls to allow 1 MP of "taxi" movement when landed on water. This makes sense given how things like floatplanes work in reality, and will be reflected in the fluff when I get around to it.

          BattleTech Vehicle Technical Readout
                      VALIDATED

Type/Model:    Mouette Hovertank 
Tech:          Inner Sphere / 3060
Config:        Hovercraft
Rules:         Level 2, Custom design

Mass:          35 tons
Power Plant:   105 DAV Fusion
Cruise Speed:  86.4 km/h
Maximum Speed: 129.6 km/h
Armor Type:    Ferro-Fibrous
Armament:      
  1 Large Laser 
  1 Small Pulse Laser 
  1 Anti-Missile System 
Manufacturer:  (Unknown)
  Location:    (Unknown)
Communications System:  (Unknown)
Targeting & Tracking System:  (Unknown)

--------------------------------------------------------
Type/Model:    Mouette Hovertank 
Mass:          35 tons

Equipment:                                 Items    Mass
Int. Struct.:  20 pts Standard               0      3.50
Engine:        105 Fusion                    0      4.67
Shielding & Transmission Equipment:          0      2.33
    Cruise MP:   8
     Flank MP:  12
Heat Sinks:     10 Single                    0       .00
Cockpit & Controls:                          0      2.00
Crew: 3 Members                              0       .00
Lift Equipment:                              0      3.50
Turret Equipment:                            0      1.00
Armor Factor:  108 pts Ferro-Fibrous         2      6.00

                          Internal    Armor
                          Structure   Value
   Front:                     4         24 
   Left / Right Sides:        4      20/20 
   Rear:                      4         20 
   Turret:                    4         24 

Weapons and Equipment    Loc  Heat  Ammo   Items    Mass
--------------------------------------------------------
1 Large Laser            Turret   8          1      5.00
1 Small Pulse Laser      Turret   2          1      1.00
1 Anti-Missile System    Turret   0   12     2      1.50
1 C.A.S.E. Equipment     Body                1       .50
Infantry Bay             Body                1      4.00
Flotation Hull (Tac Ops) Body                1       .00
--------------------------------------------------------
TOTALS:                          10          9     35.00
Items & Tons Left:                           3       .00

Calculated Factors:
Total Cost:        1,297,100 C-Bills
Battle Value 2:    624 (old BV = 390)
Cost per BV:       2,078.69
Weapon Value:      234 / 234 (Ratio = .38 / .38)
Damage Factors:    SRDmg = 8;  MRDmg = 4;  LRDmg = 0
BattleForce2:      MP: 8H,  Armor/Structure: 0 / 4
                   Damage PB/M/L: 1/1/-,  Overheat: 0
                   Class: GL;  Point Value: 6
                   Specials: tran4
 

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Be careful what you wish for. I might let you have it.

i would suggest to calculate movement like a surface ship, as the props of the hovercraft would push with a rate of 105 in this case the flotation hull should be able to do 3/5. maybe you could reduce that for a body that is not shaped to move in water but a 1 movement would be too slow IMHO. and when a hover is created with flotation in mind the engineers would try to get it to swimm like a boat.

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typos and spelling-mistakes are property of the finder. english is not my mother-tongue.

I can't really justify that much, because it would make flotation hulls unbalanced. What you're suggesting would push flotation hulls (which cost no additional weight, space, etc.) into the realm of the Amphibious mods and encroach on the realm of real wet-hulled boats.

The idea of having 1 MP movement for flotation hulls is for a hovercraft or WiGE or whatever to get around at speed using its normal mode of movement. But when needs be, it can land on the water and bubble its way along in a more quiet and controlled manner. Think of it like a jumpship and its "0 MP" drive; the vehicle can use that 1 MP to keep station against a current, nudge up to a dock, more quietly approach an enemy shoreline, and other low-energy or high-precision movement. It's not unbalanced, and it actually makes sense that way in reality.

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Be careful what you wish for. I might let you have it.