For economy reasons, due to the relatively low volume of sales, the Tee Dee .020 and Pee Wee .020 used identical pistons and cylinders. Tapered honing and all, I was told. You would have to "mike" a Pee Wee Piston to verify this.
There may have been a .010 reed valve engine prototype, but the production .010 was only Tee Dee front rotary.
Early examples could turn that small prop just at 30K on 30% Nitro. The current ones are OK, but not in that class, probably pushing hard to reach 25K.
Good show on the Barnstormer family, I want to build one eventually too! I would be more likely to scale the big Barnstormer down to about 250 sq.in. for an APC .061 and Leprechaun competition.