yeah 10 is a great length, that's what size i have, i'm able to get brittany's and fed's on it and my friend is able to get 2 pretzel 2 so that is enough to give you quite the variation of tricks on it
i find mine quite short sometimes, its only 10 feet long, i made it last november and might make a longer one this fall, sorry for the shitty pic, i took it on my old phone
You should build an elbow or a z rail out of thick tube, just sayin. You got the skills. And I think one of those would be fun as hell! Presses galore.