Marcos, I checked how long did it take to come from CT spawn and from T spawn to some locations and it's showed in table below:
And there is changed version of the map, I deleted connector from rooms before A and B as you can see on that picture:
I thought about yellow area between bombsite B and powerhouse that I planned to do, because it's in front of way of CTs and it's able to look form hall before powerhouse from T spawn to hall form CT Spawn, so it's really long area. And second yellow area is near vent because I think that rotating from 1st to 2nd bombsite is so short if you need about 7.5 seconds, but I will probably leave that as it is.
And I want to add 1 thing - easy entry to vent is from CT Spawn, so they can jump over box or sth that I will do, but nobody will be able to go to that from A - I mean without boosting.
Markos, I like your idea with rails from north to south, but I'm not so sure that I understand what you mean. Can you download that picture and mark rails in e.g. purple color?