Great idea for a thread! Here's my Shrike. It's powered with a rear exhaust K&B 3.5cc (.21 cu in). Has a Macs 3.5 tuned pipe. The engine is still fairly new, so I'm going easy on it. I've got it proped so it turns around 18,500 RPMs. I think it's got a 7x8 prop, but it could be a 7x9, not sure.

During construction I moved the firewall back about 1/2 inch to compensate for the extra weight. With the battery all the way back in the radio box, it balanced just right. I also replaced the spars with hardwood.

If you look very closely at the left wingtip you can see the antenna wire. During construction I installed a piece of pushrod tubing from the radio box to the wingtip so I could route the antenna through the wing.

Edit: weight is 2 pounds 4 ounces, 1020 grams.