About cutting.

Seriously, this is what you think is funny? You come on here like you own the place as a new member, and not trusting any of the words that experienced audio epxerts like Lev and Marjan speak. Believe me, i've been on here for 6 years now and i've only learned from and shared with this community, by reading/posting about theory and observations around different speakers/amps/cabs. The way you're approaching this forum is far from serious, and can only be described as funny. 

Ooh, didn't notice page two!!!
Oh dear, you have embarassed yourself internationally.

In case anybody else reads this and cant figure out cut sheet, here is what I have done.  I get 4 x 8 sheets of plywood here in America, and I am not sure what is the standard size in Europe.  But I just got 2 sheets per box of 4' by 8' and cut one into 4 strips of 600 mm by 4 foot.  Cut one more strip like that off of the second sheet and then with the remainder of the second sheet, cut your two side panels.  Cut all of the other pieces from the 600 mm strips, starting with the larger pieces.  Braces should be cut from whatever is leftover.  If you have the lumber yard cut your stuff, you will have to plan out the strip cuts ahead of time, but that should be easy.  I decided not to have the lumber yard do it because they would only vouch for an accuracy of 3/16ths of an inch (4.7 mm).  I can cut much more accurately than that, so that is what I am doing.

I have officially switched to metric.  In America, this makes me a terrorist, but feet and inches are annoying to work with.  Metric is so much easier to use in a practical sense.