i hope it would be easy, but i doubt it after reading the modding instructions. anywho, it does look possible..
would like to be able to custom mesh some defensive units for basebuilding.

a map with only one or a small amount of points on it already held by the player would be great to use for basebuilding. this might reach over to the developer specific content, but a "defensive" gamemode where you legit just build a base and hold it against waves of enemies to see how far you get would be great.

some ideas for defensive structures would be (after buffing defensive structure amount)

- make barbed wire and trenches connectable
- landmines both AT and HE
- MG nests
- artillery emplacements
- operational airfields where your planes will land and resupp/repair (which you have to protect with your units (hense why we would need to 3x the size of the map
- concrete bunkers (or upgradeable to concrete from wood for CP) including:
- HQ bunker (boosts unit effectiveness due to command staff as per mechanics or could be the source of your command points, the more you build (with a limit) the more CP you get)
- anti-tank/ship gun bunker (already IG but need more variety) such as 75mm, 76.2mm, 88mm, 100mm, 105mm, 122mm, 150mm, 170mm, 210mm, 240mm, 280mm (for historical accuracy)
- telephone bunkers (to keep units connected ( mechanic already IG)
- infantry bunkers
- garage bunkers where we can repair and resupp vehicles
- observation bunkers (to be placed in dense forests to maintain an eye on enemy troop movements

it would also be necessary to add in the ability to "dig in" vehicles, build sandbag walls, "foxholes" for infantry.

this is just a start though, and maybe if im not the only one craving this type of gameplay from this genre of game, itll happen, feel free to add input good or bad, suggestions for changes, or if you are a modder and willing to help make this happen. if we cannot do this as a mod, maybe we can get some push for the devs to do it?