The inspiration for this comes from a short data entry in a timeline of military technology from the Science Fiction role playing game,
Traveller. Managed to find the relevant quote pretty easily:
LBB:4 Mercenary
"Tech level 11: All combat vehicles are now grav powered. The grav tank generally utilizes the more compact plasma A gun and/or tac missile racks. Very heavy grav tanks mount the plasma B gun. Light grav sleds are used for scouting, generally mounting tac missiles and autocannons.
Close support sleds mount VRF gauss guns and tac missiles. All vehicles have pronounced free-flight capability.
Tech level 12: All vehicles have sufficient free-flight performance that ground combat vehicles effectively no longer exist, having merged with aircraft. The primary weapon of the heavy gunships include plasma B guns, VRF gauss guns, and tac missiles. VRF gauss guns are also widely mounted on personnel carriers, as are plasma A guns.
Tech level 13: The first damper fields allow protracted storage and transportation of elements with short half-lives. The first major use of the damper field militarily is to enable the manufacture, storage, and transportation of 2 cm californium rounds, fired from auto-cannon mounts in remotely piloted drones. Each round is hollow and collapses on impact, the collapsed round having sufficient mass to go critical, thus causing a small nuclear explosion. More conventional gunships mount plasma C guns or fusion X guns along with missiles.
Tech level 14: More sophisticated damper fields render the californium drones obsolete.
Gunships now carry fusion Y guns or rapid pulse X guns.
From here:
https://www.travellerrpg.com/threads/grav-tanks.7348/Started with this pile of parts-
DSCF1250 by
VileDr.Yo, on Flickr
Got this done over the last two days-
DSCF1251 by
VileDr.Yo, on Flickr
DSCF1252 by
VileDr.Yo, on Flickr
This is 1/35 scale.