I was gonna suggest 2 engie limit.  3 at most.  4 is just too much...way too much.  I shudder at 4 engies defending the first point on the 3rd level of egypt.  its crazy difficutl for blue team to ascend that tower if red has alot of prepared engineers.

1 uber demo (2 if the demos aren't that good) = 4 dead engis

The fault is in the 32-man server being unsuitable for any of the stock maps or the community maps Valve picked, not the map itself. The map is just plain bad and makes no sense in the TF2 paradigm. Oh yeah, the map sucks, too.

For the good of the servers, though, replacing the Zombie server with a 24/7 Egypt server would be a logical idea since the Zombie server is either completely full or empty with few moments between the two extremes.

I don't agree with class limitations, though. Limit the team to 2 engineers and the 8 demomen on the attacking team will make their two meager sentries useless. I don't know how bad it is to attack the third stage against many engineers (how often does it reach the third stage, anyway?), but RED should be allowed to make good use of the awful map design to its fullest. 5 engineers should be an absolute minimum for class limits, because that's still less than 1/3 of a full team.