Future changes:
So currently red is having a hard time holding last for very long, and I think it is really due to the short distance between 3rd and last, so in the future I plan to extend the straight-away after the left turn. I'm thinking around 256u.
Okay so I'm an idiot, and wasn't particularly thinking this bit through when I quickly put together the A2 log. Due to the nature of the rail bridge and the final goal being the destruction of the bridge, I can't actually move the bridge back 256u. After watching the demos again and again I came to a better conclusion about what needed to be changed and what I could change.
The position of 3rd, and generally the buildings around it were the problem with last/third being less defensible than either 1st/2nd. The passages through the box/crane room were letting BLU get behind RED/3rd too easily. So I've increased the distance between 2nd/3rd by ~512u and 3rd/last by 288u. While there is still one passage in box/crane room to get behind 3rd, I've made it harder for BLU to reach it, and also closed off a route toward last to force any BLU players back towards 3rd.
Still some more work before A3 is ready (tomorrow probably), but I wanted to correct my mistake and..
I wanted to announce that I'm looking for someone who might be interested in detailing this for the contest. I simply don't have enough detail experience. So take a look at the map and see if it's something you like. PM me either on here or steam please, I'd rather not clutter up this thread atm.