globe master
1 replace all plywood formers aft of the wing with balsa ply.laminate 2 sheets of 1/16 balsa with grain 45 degress to each other ca or poly u glue .
2 same with wing ply ribs
3 add 2.5 degrees washout
4use lite wheels
max weight about 7.5 pounds so on this size you may need to forget retracts
5 check fuel tank location you may have to build your own to fit not much room in the nacelle or one fuel tank in fuse feeding all four engines with pumps.