I think you need to decide in this case which you want to do more, build or fly? I say that because if you're are just coming off your Trainer I believe you will find a Cub to be a bit of a handful in the air, & as redfox stated crashing a plane you built from sticks up is gonna hurt alot. I think you'll find the Spacewalker to be a much better suited #2 plane for flying. My #2 plane after my Trainers was a Dragon Lady with a Saito 100 on it. It is very similar in looks, style, & flying characteristics to the Spacewalker. I found it to be a very good step up from the Trainers. On low rates it is very docile & well behaved, on high rates it can be very aerobatic as well. It's really too bad you're on a budget right now because it would be ideal if you could ARF the Spacewalker & be furthering your skills as a pilot while you were building your Cub. Since it has to be one or the other for now I would choose the Spacewalker & build the Cub after I had more stick time under my belt, but that's just my opinion. Good luck in which ever route you decide upon.