Hi Hobbsy ,
If your looking for a great (inexpensive) way to get your 56FSA into the air , you may want to look into the GP "Escapade" (smaller of the two versions , the larger is more suited to a 90 four stroke I believe) . This ARF cost around $100 when I bought it some years back , Hell the on board glow driver I put in it cost almost as much ! The model truly flies like it was made for this engine and is one of my favorite small planes . I did customize mine somewhat with the on board glow (only cause I hate fiddling with glow sticks) , lost model locator , real aluminum spinner with a wooden prop , removed all the "nascar looking" stickers from it , better wheels , and of course removed the pilot figure cause I tell everyone when asked why no pilot ; "Thats MY seat" to which they think I've really gone over the edge ...