I think the floor plan is a good start, kind of like when you first start drawing something, where you start the simple shape and size of whatever your drawing, and the final just gets drawn over it...I can't remember what that's called but.. yeah that.
I think there needs to be a central area that gets worked on. Perhaps the area where all the three levels meet. It needs to be opened up a bit, considering that movement is so fast that you fly through it pretty quickly(at least with promode enabled).
As far as promode..the map is somewhat flat, and has many bouncepads. I'd say add more double jumping options for human players to use, yet stairs and bouncepads are necessary to keep the bots working...which is kind of the tricky part in keeping the gameplay strong against bots and not killing the gameflow in the process.
As far as hallways like Fjoggs mentioned, I think they just need to be bent up a bit so they aren't so straight. Maybe another floor above them in parts but opened up for connective accessibility. The hallways have really low ceilings also, as I felt like I was going to hit my head at moments..I think that could be played around with also. I was surprised to see you pop another one up...
edit: All of what I said above was about the first version, and rather than picking it apart I'll just leave it at that..since a good majority of it still applies to this one also.
Also, in this version..when you go through the tele behind the YA, you end up hitting your head on the other side when coming out, so you don't get the two jumps too the RG going on.
]. I did notice that the bot I was playing against didn't go for the RG very much, but did occassionally have it. Might have just been the bot though. \addbot Visor 100. Yes I'm using CPM as my preferred mod -- I suppose I have you lot on here to thank for that. :P... the cheeky SOBs hide round corners now and run away when they are low on health.... gotta change my whole gameplan now ... sighs.
)
.... Anyways I thank you for the consideration as I feel I may have assisted in pushing you into making that decision. And I'll provide more feedback on this once we have a botfile. 
...as Fjoggs had mentioned about sexalicious..hehe I do agree.. in the possibility of this being your last map, it'd kick some arse if you did it up with something that hasn't been done in a Q3-Q2 styled map.