They are Almost Ready to Cover planes. They look great and have all the parts to frame up the plane. The instructions are OK if you built before. You still need to cover this as well as paint the fiberglass parts. I'm building the ISC Pitts Challenger II with a G-62. These planes were specifically designed for the Zenoah propellants but they do not finish the engine box, so you could set it up for any power plant.

I flew the Challenger I version a few years back and it was very easy to fly even for an less than seasoned pilot such as myself. I was a bit of a bear on the ground. The new longer aft section was supposed to help that issue.

If the 300 is anything like the Pitts you'll get a nicely framed up strong plane for the money.

Just remember it's half the work of a kit but three times that of an ARF.