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Forget paper thickness.
(I've never seen mil thickness used in paper kits anyway)
If a part needs to be a certain thickness (eg 1.2mm) then that will be specified, regardless of paper type/weight.
Obviously a standard paper weight, somewhere around 67lb cardstock is recommended for building.
67lb is specifically "cover" stock or similar...
I use 65lb cardstock (which is a bit cheaper).
Its close enough to the same thing, and the same thickness (about .23mm).
The reason 20lb paper is recommend for other parts, is because they are smaller parts.
Or they may be harder to roll or form...and thinner paper will work better.
But again, the actual thickness of the paper isn't the issue.
..24lb premium paper is often used,
and its basically the same thickness as 20lb, just a smoother finish.
So anything is that range will work.
So, I'm not sure why a kit would be confusing us with "mil" thicknesses.
Its pointless...unless I am missing something here?
Card thickness will also not affect how well a cylinder rolls to the desired diameter.
It might be harder to roll small tubes smoothly, but whether or not you roll it to a certain diameter, is totally up to you.
If parts are not properly matched...ie the kit specifies a 3mm tube, and the hole drawn is only 2mm...then thats designer error.
Just adjust the tube or the hole to match.
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