Seriously love them frames <3
Id get a try all nuc stem 150x30 and some decent riser bars on it....When i used to ride my mates one i remember it being kinda weird to get on to the back wheel Because for a mod its quite long. (im also short 5.ft 8) but after like an hour on it My mate found it hard to get me off it ..Really fun bike to ride......stick with it you will get the hang of it Trials is very demanding on the body you will ache like a mofo but it will pass.
Anyway your in good hands on this forum ..the guys here really know their stuff And are generaly a good bunch .
Welcome to trials