Another Clip Bag (parametric)

Trying to understand Openscad 3d design capabilities I decided to work on something practical, a clip bag, even if I found tons on thingiverse it's a simple project but with some design difficulties for beginners like me. For example, I used small gaps in joint parts in order to avoid usage of support during 3d print. Everything is parametric so it's possible to alter size, radius of the thing and add a carved text as well. I quite satisfied with the result and I decided to share it to the community. It prints good in PLA with a >30% infill in order to make it solid enough. Every suggestion on how to improve the code is very welcome. Hope you like, and good 3d printing!