How about AvD with only engies deffing?

[A1win]

I got this idea some time ago... An inside AvD map with engineers defending. There should be lots of mechanisms etc to help them, such as toggleable hatches over windows so you can build SG behind it and then open it, and close when it's about to break down and so on. Maybe some traps too, breakable/fixable stuff etc...

Offense shouldn't have classes that take down sentries easily: scout, sniper, medic, spy... I'm suggesting they'd have soldiers, demomen and HWGs (pyro isn't really the best against engineers). Nail grenade is quite crazy too, but secondary grenades should probably be difficult to obtain for the attackers.

There isn't much of a plan other than this yet, but would be nice to hear ideas from others. Would this even work properly? Would the map favor the engies or the attackers if nothing was made to balance it? Anything really...