I'm going to address an attitude I see in your post that is way too common for beginners- the mindset that you plan to crash and destroy your airplane. If that's what you plan for, that's what you'll get. You could save yourself some money and just stomp on it a few times before throwing it in the dumpster. The end result will be the same.
A much better route is to plan to fly successfully. You are smart enough to know that you aren't a good enough pilot yet to fly an Ultimate Biplane. That's good, leave it alone for now. Get yourself a proper trainer, and plan to fly it right. Hook up with an instructor so you learn good piloting methods from day 1 instead of learning bad habits that will bite you later. If you will make the investment now in building your skills with appropriate airplanes, you'll find the flying hobby very rewarding. I run cars and a boat too, and they don't compare to the joy of flying a plane well.
You said you have a Jr Cub. I haven't heard of that. What brand is the plane? Is it a true scale model of the Piper Cub (terrible choice for a trainer) or one of the foamy 3 channel planes that look a little bit like a Cub but fly like a trainer?