Just out of curiosity, are bans still saved on local disk like they used to be?
I mean, flush your cache, change your ip and get a new account. You should be completely untracable, unless UG knows some secret magic I don't.
For the really long straight bridges just build a long line of triangles pointing either upwards or downward depending on where the supports are and then connect the tips. After that reinforce where it breaks and you bridge should hold