Hi Pilou, I'm trying your steps in SketchUp, but as far as I can tell you can only push/pull one single outline at a time, is that correct?

I mean you show one step in your instructions, but is that actually 5 different push/pulls, one to cut each rectangle? Or am I missing a way to do multiple simultaneous push/pull ?

re: 30 seconds - I await your video to show it! That much time goes by very fast, so you may be surprised...

Your steps definitely look good though (except not using stock SketchUp!), but also what if the number of holes grows? I think it could be quite tedious to form each hole by an individual push/pull action.

I mean something like this for instance in MoI can be booleaned by selecting all the cutting objects in one boolean operation:





So for example that is 21 holes cut with one boolean in MoI.

- Michael