I basically use the board game rules as is. I use a more true line of sight as the 20mm buildings don’t work out perfectly with the 4” hexes. Stacking is allowed, 3 squads, etc.
For multiplayer games I take out some of the more complicated rules - ELR, fire lanes, etc. I simplify residual firepower to a pin check in any hex that has residual in it. Little things like that.
Thanks a lot!