I think a hovercom would be slightly more interesting, but overall still not worth putting work into.
- Cannot climb steep hills
- Clumsy turn radius
- Recon base speed with more health (but no jump) - maybe Engine or Strike level base health
- Travels
over water rather than below - meaning it can always stay cloaked or fire, but cannot submerge to avoid damage from surface guns.
- Two weapon arms, like Guard or Strike, but no innate survival benefits (like Guard's innate hp growth or Strike's innate regen).
Overall
+ Hover - can use weapons and cloaking in sea
+ Speed - as fast as Recon without jump (but no innate boost with levels)
+ Guns (fully two of them rather than upgrade/replace Engine style or Underslung/Replace Recon style)
= Health - fairly average, between Engine and Strike chassis
- Maneuverability (other coms turn on a dime)
- Passability (can't climb hills, and other coms are amphibs, so its over-surface travel doesn't give it that much)
This could allow several interesting builds and maybe unique weapons.
- Sea-going cloaked antiheavy - basically, your standard Strikecom dgun, except in sea.
- Rapid expander for flat maps - this is probably the strongest reason to ever use such a thing
- Überkiter, because it's base speed is higher than Strike's and it can dual-wield
- Naval combat support and armed expansion - currently in deep enough water, only Recon can even use the Disruptor Bomb, and even there it requires a jump-then-dgun-in-flight micro, and walking further out with your com is asking to die to a single duck.
- It could be allowed to have a gauss gun because it will never be able to attack underwater-to-surface with such a gun, because it cannot submerge.
Additional thought could be given to what could its per-level bonus be - Engine has bp/buildrange, Strike has regen, Guard has hp and damage, Recon has speed. Maybe it could slowly lose its vehicle-like maneuverability malus. That is, thought could be given if it was worth working on; which it isn't.