Thanks.
The gigs for the upper wing are rather easy to build. First you need to check if your kit is accurate by comparing the struts with a scale plan. If they're OK, you just need to draw the shape of the interplane gap, ie between the bottom of the upperwing and the top of the lower one. Then you just use this sketch as a template to cut the plastic gigs. For this kit, I only had to fine-tune them once (they just lacked 1mm in height).
The red is a bit brownish and dark, it's the idea I have of the kind of red paint I think they used back in that time.