.... I wonder what a framed gallery of "regular" repros would look like....
You can do repros the "right" way but most collectors don't have the technical skill/software/drive to do it right.
1) Find an XL unwatermarked image of the poster you want to print.
2) Convert the image to a lossless format, tiff, png, psd, etc.
3) Digitally repair its fold lines/defects/color issues in Photoshop.
4) "Blow up" the image to 5000 pixels height with after-market Pshop additions like:
https://www.alienskin.com/blowup/5) Take to a professional printer.
I did this 5-6 times back in Round 1. The posters looked great! My favorites:
Printed 27x41 This Gun For Hire (combo of HS and 1S)
Small version of cleaned-up BoF image:
Printed at 27x41 and displayed at office 2013 Halloween party: