Well, I like to hike. I like to spend night in the Outdoors, on mountain summits. Therefore I need a shelter. A light one. Small one. Cheap one. No fiber poles. And there is an enormous choice on *-bays today. Still, the price and what I like rarely match.
So, DIY necessity was a way to get what I want... and here is a result.
Step 1: Testing of idea
Well. I took my hiker stick, thin ropes and assembled how the tent should look like in nature and to get proper feeling how it shall be as well. Of course, rope-line shall help to determine dimensions. I put my self in....... and this evening decision about everything was made.