Bruins - not trying to talk you out of it, thats just my opinion. Hopefully you can see it fly in person and talk to the owner. If you can make that Trojan do exactly what you want it to consistently and your not crashing or tearing it up, then this might be fine for you. Your the only one that can sort that out. If your not sure, just try to be more proficient with the Trojan for a bit longer. Do nice round loops and enter and exit at the same height. Do stall turns and follow the same up and down lines with just a rotation at the top. Try doing slower rolls and feed in rudder each time, try doing rolling circles. Practice spot landing and not just letting it land where it wants. Practice using rudder in a crosswind. Those are all pretty straight forward things that will make you better regardless of the next plane. Just do some of this boring stuff for a few minutes each battery and then fly the crap out of it however you want! This hobby is suppose to be fun.
There sure is no shortage of people telling you what to do on the internet.