Case for Seven Decade Programmable Resistor Board

This is an adaptation of zapta's Gerry Sweeney's Seven Decade Programmable Resistor Box, http://www.thingiverse.com/thing:521303. The remix adapts the design for use with a different China-sourced seven decade programmable resistor board available on eBay. These boards are approximately 65 by 90 mm in size. The board listing titles include the text "1R 9999999R Seven Decade Programmable Resistor Board Step 1R". I was initially planning on building a switch-based decade box, but for $9.98 USD total cash outlay I couldn't resist purchasing one of these boards.

In addition to dimensional changes for the different board and size of corner screws, the remix also uses the MCAD library polyhole function for improved dimensional control of the corner screw mounting holes. Various improvements have been made regarding geometry overlap in order to provide a cleaner preview in openSCAD and to minimize any mesh issues in the design. Additional revision notes are provided in the openSCAD