tbh, you wouldnt be able to create such a map on offcial quality standart! creating camping spots is a bad idea AS you already reduce the flow of gameplay while mapping! imho, very bad idea :D

imo a layout has to provide fluent gameplay (space for movement everywhere with the possibility for tactical variatons i.e. long/direct way to base) I think ideal would be mid = direct; left/right = long. you should be able to cut from left to right at certain points.
at the same time one has to keep in mind to make such a layout fair to both sides which is the hardest thing while creating a map.

pickups are a good way to balance the gameplay if the layout is not 100% fair (which is not possible unless you make a symetric map) so placing certain pickups only left and certain pickups only right is no good at all! just imagine the mess if 6 players constantly are right to pickup health ;) also pickups should be very limited (the maprestrictions already cover this)