Ok. i got the fuse about balanced with 2700g driving batteries+500g soloprop+400g spinner+1350g motor+500g sound system+ 500g receiving batteries. this is 5950g =13lbs. if saving 300 to 400g from tail means almost 2kg weight saving total. 4,4lbs total.
so that really need to be done, fuse itself is light(2900g inc. tailplane and tailstrut), but those controls were badly over builded with sandwich construction. hope this helps....

Jukka