Converting papercraft templates to scratchbuild blueprints

[Evil Eye]

A bit of a weird question, but does anyone have any good advice for how to translate papercraft templates for 40K vehicles/buildings to styrene scratchbuilding plans? I found a good repository of 40K vehicle papercraft plans, and figured I could use them to build styerene hulls whilst resin printing more complex details- both saving resin on large, slow to print components and also expanding my skill set. In theory it works- both being methods of turning flat materials into models- but I'm stumped on a particular "translation" issue. Ironically, the problem isn't "how do I turn 2D details into 3D", but rather an issue of thickness. Obviously, papercraft is meant for use with paper, and even stiffer paper is by its very nature very, very thin. Styrene kitbashes, meanwhile, require multiple thicknesses of plastic sheet, usually ranging from 1mm to 3mm; is there a good, reliable way of working out which thickness of styrene I will need for any given piece?

 

As a side note, has anyone tried using a Cricut for scoring initial snap-lines in styrene? Seems like it could be a good way of mechanizing/semi-automating styrene kitbashes (especially for those of us who can't cut straight lines to save their life, even with the aid of a Tamiya scriber and a steel ruler...).