In that case , falcon marine is your best port of call.

They have the AHPC superwing alu mast which is excellent en the only viable alu option for the F16's as the other wingsections are all geared towards the F18's a a few kg heavier as well as too stiff.

Falcon marine also uses custum designed alu beams originalky designed by Phill Brander, Marcus Towell and myself. These strike the best balance between stiffness, weight and ease of incorporating them in the overall design.

I would at least use these for the mainbeam as you may get away with a lighter rearbeam, but the gains will be limited as the beams best work in tandem to provide for ample platform stiffness.

I hope this helps.

Wouter