With all due respect iakovl,
Do some reading, there are plenty information on the forum for you to make an educated guess about sizes, design, etc.
One thing is to come up with something more or less ready and ask for an opinion in how to improve it. Another totally different is to try get a complete project...
Try to look at finished blocks that looks like what you want, and than base your design on them.
And who knows, maybe someone has something ready and would like to share it with you.
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TaTs