Mark holes where two parts connect

Hi all,

I make my own furniture from DTD boards (18 mm thickness). I design the furniture in sketchup and then I take my laptop to the my garage and when drilling holes for screws and dowels I have to measure hole positions from my sketchup model. This is however very time consuming. I was thinking if there is some way (e.g. extension) that would mark the position of the holes automatically. Please see the provided example. On the left there are two boards screwed together (the boards are always connected at 90°). On the left there is a result I would like to achieve. The holes are always located 10cm from the edge, but I need the height of the position of the hole.

Could you give me some advice on how to achieve this? Or is this impossible? Thanks.example.skp (225.7 KB)

In the future, please do not double post.