I'll answer your questions but I'd start a new thread for your build and get them answered there. Don't want to muck up this build thread.
Sounds like the pump from thrust is different and will fit without the tunnel modifications. The one carter sells you will use a 155 stock pump or aftermarket and adds a ton of volume which the blaster tunnel needs. Each pump size requires a shoe that's made for the diameter of the pump so it seals up.
Simple video on the tool
I got a @Torrent 155 M.M with Raider trim and @Carter B tunnel build done!
