Well I think your english is very good. Not in any way poor at all. I think being multilingual is a very big achievement to being with, and your english is really excellent. And it doesn't take much ipe sometimes to make a heavy bow. It is very dense and hard, so it can take less material to make the same weight as other woods. I would need to convert the metric to inches to tell you if your dimensions are good, as I am used to inches and am not very good at converting the two, but I go around 1 1/8" inch wide at center, 13/16" to 7/8" inch thick at center, 1/2" inch tips, and around 75" nock to nock length. I leave it the same width about 8" or so in the center before tapering to 1/2" tips.