Deburr and Prime new skins 1, 4 and 5

New skins 1, 4 and 5 were shipped as the originals has excessive hole drift and cut-edge in regions, which would have necessitated upsizing. This upsizing would have been problematic for skins 1 due to the need to use 4.8mm Avinox stainless steel rivets (which I did obtain), but I decided at length not to upsize the main spar holes. Skin 4 was a problem as the misalignment would have required a lot of upsizing of both 4mm and 3.2mm rivet holes, an even then there was quite a mismatch with skin 5.

Deburred, mostly by sanding, edge-smoothed and primed as usual. I am applying primer on the external rivet lines.