I was told you were looking for some feedback and this seemed to be the correct thread to use despite it being fairly old. I'll go over some of the problems I have had with the map in the past.
http://puu.sh/h35UY/6afa7c9cfc.jpg
I would suggest moving all the spawns forward so that they are at least all on level ground, there has been many times in the past where my medic could not reach a demoman because he was on an opposite level and had to either have everybody crouch and the demo jump or vice versa.
http://puu.sh/h366t/c222b9cd31.jpg
I would make his whole wall flush leading to the door so that you cannot get caught on the wall when trying to exit spawn. Also I would clip the corners of the door so you cannot get caught on the metal frame of the door in the same fashion.
http://puu.sh/h36eC/83b25a7bf2.jpg
Lighting error under the fence prop, not really a big deal but since you're in RC you should probably fix it anyway.
http://puu.sh/h36me/0b909e1094.jpg
The door on this shed should be clipped over and maybe have the roof on it be similar to the roofs on viaduct so you do not get caught on it when you're rocketjumping.
http://puu.sh/h36pI/3a13fd31e6.jpg
Lighting error
http://puu.sh/h36tv/fb40aa2f8e.jpg
That fence prop is the only one on the map that will eat rockets, I would change it to be like the others for consistancy. Not sure why you have the wall indent there since it only provides a place to get stuck on, would recommend clipping it over or just making it flush. Also there are a few lighting bugs with the vent props just above that indent.
http://puu.sh/h36FR/fd4e1135f3.jpg
Another thing you should probably clip off or make flush imo. I would also add a clip brush to prevent getting caught on the door frame and maybe make it one solid piece so that there is no weird strip in the middle. In the corner there also seems to be a small gap in your brushwork, probably worth patching up.
http://puu.sh/h36Me/7ad8d27f56.jpg
Another prop to clip over.
http://puu.sh/h36Qr/89d3f7f40b.jpg
Would suggest making this flush to prevent getting caught where the curved and straight walls meet.
http://puu.sh/h36X7/96fcc7fe39.jpg
Another prop to clip over.
http://puu.sh/h372a/50990db5fc.jpg
Lighting bugs in the corner and you forgot to put a door handle on one side of that door :^)
http://puu.sh/h379Y/e8710f7f4a.jpg
I cannot exactly show it off in a screenshot but as many people who have played this map (with player shadows on) have noticed that you can see peoples shadows projected on this wall, while I know this is an engine level bug I would try to fix it as it's one of the more annoying things about the map right now.
http://puu.sh/h37gO/6bd0525f75.jpg
Would suggest having a full clip brush over this leading into the ground to allow for slides on the pallets, right now you can get caught at the area where the two props meet. Also probably remove collision on the propane tank as the top part of it sticks a bit out from underneath the ramp and people can get caught on it.
http://puu.sh/h37n6/f4a6f833f4.jpg
Lamp prop is not centered over the door (As it is on blue side)
http://puu.sh/h37qp/7a34d72aef.jpg
Should clip over both of these doors.
http://puu.sh/h37xW/d87dcd0cb9.jpg
Probably should remove this hiding spot since it's kinda dumb because of the shadow bug anyway, also clip over that door.
http://puu.sh/h37BM/b6aa80ec73.jpg
Clip the corner between the box and the wall so people do not get caught there.
http://puu.sh/h37J2/5d8d1ebe75.jpg
The prop collision is pretty bad on this truck, I would try working with it slightly so people do not get caught on every single random part of it.
http://puu.sh/h37NT/012a8ada97.jpg
Fairly sure you have already done this but bulletblocking bottom edge at the stairs and the edges around the area under the point would also be nice.
http://puu.sh/h37T3/17cd0ad0e0.jpg
This clip brush to cover up the lamppost is pretty weird since you can still get caught on both sides of it.
The last two things were sent to me by JackyLegs and I was told to add these into the post.
https://i.imgur.com/c4UxpGD.jpg
Room filled with missing textures, if I remember correctly this used to have the "Do I sound cool" picture in it but was removed from rc3-rc4?
https://i.imgur.com/sFNxmF0.jpg
This one only really annoys me in DM but it does look pretty weird so I would maybe have the door go into the floor instead of out through the roof?
I will probably update and revise this in a day or two but for now that is all I can really think of off the top of my head.