Lee, The Tiporare is not a good choice for a 4 stroke. I tried doing this for friend long ago..... make a long story short..... there is not enough room in the nose to put it inverted (can not even get a 60 size 2 stroke in the inverted or upright. It is that narrow). By the time I was done. I had to rework the nose which consists of widen it out, cut it in half, and making the bottom removable to get to the engine, etc..... I had more time in the front of the fuse then I did building the rest of the plane. Also....You will not have a choice in the matter as you will half to build a tail dragger out of it do to the firewall being so far back to get the 4 stroke in there. Not enough room for the nose gear.

Another thing to think about is the stab. The Tiporare has a anhedral(?spelling) stab. This will cause a problem with groung clearence if built as a tail dragger. You will half to build the stab staight. If you do not..... you will have very eventful landings (and takeoffs in some cases)

Don't get me wrong here... it can be done.... but the effort (amount of work) vs. final product (plane and flight performance) was not worth it in the end. When all was said and done, the plane didn't look like a Tiporare..... and didn't fly like a Tiporare.