Finally found a nice sweet spot of Czechoslovakian border line fortifications where it is possible to capture the entire line on map...
It's the Bratislava-Petrzialka bridgehead, the only fully completed portion of fortified line. More details here:
Tank-Net post
Going to create the map. That would take a long time as it would be 200x160 map but the result would be interesting I believe. River, three bridges to cross and all that...
But at first I'd have to choose some easier portion of the fortified line (and smaller) where would I be able to try out correct in-game placement of both heavy and light pillboxes.
So... No deadline for now. Just to let you know of the idea.