RE: Top Flite 1/7 P-51 Build
I gotta admit, I forgot all about that one. Total weight of the FG20 with ignition and muffler is a little over 30oz. It's only 105 mm tall, compared to the 120 at 92 mm (from mounting ears to rocker boxes; glow plug on the 120) so it shouldn't stick out the bottom too far, if at all, and the rear mounted carb elliminates the big hole in front, where the cowl is very shallow.
The only unknown is the performance. They don't have any specs, yet.