To sand the laser cut balsa parts to the right thickness, I’ve used a neat little trick: attaching little pieces of the right thickness on either side of your sanding block. This way your sanding block will stay perfectly level and you will never sand too far, automatically stopping you when you’re at the intended thickness:

Thickness sanding becomes a breeze, but wear your dust mask, balsa dust is quite irritating:

After the epoxy has cured, I’ve started gluing the rest of the frame:

Which is coming along very well:

I will build both fuse sides flat on the building board, bending the aft inwards after the front fuselage frame is fully built up.