dannost,
You asked about weight compairison vs. a royal 38. We have a royal P-38 which weighs about 14#, flying on a pair of OS.46s right now. Originally powered by fox .40s. It has fowler flaps as well and its really quite a joy to fly (if you put aside the worries of multi engine). The fowler flaps really help with the landings, much more than I'd ever imagined. We're going to take it out for a flight this week, if the weather holds. First time out for this year...

Good Luck with your's.