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Well, that was hard to get to! I also had this issue, on top of a side panel that didn't fit (sorted) and a snap in the side (haven't fixed that yet) it's been a bit stressful.
But, I got there. So,...

Also just noticed a crack in the side under one of the supports for the proxxon. Bit of glue will sort that out. Might be a weak point during shipping though.

Took mine home today! No double sided sticky tape in the box, but looks good.
Edit: actually, the right hand side panel wont accept either perspex side piece. Seems to be 1mm off. I can sand it...