Files:
Cutting: Black: cut (first); blue: cut for marking; red: cut (second). Cut at speeds 6 and 9 for 5mm and 3mm respectively, power 100. The cut for marking is to mark the glue joint position, at speed 400, power 18.
Slot sizing: The nominally 5mm sheet was actually 4.67 - 4.75, and the inter-vertical measured separation 6.34 (with a spacer and three washers, tight). Pivot joints have two washers. The slots for crosspieces linking the two verticals are are nominal 4.7 wide with nominal 6.6 separation; a fairly snug fit for a somewhat off-axis laser; that must be changed for different thickness.
Materials (these dimensions from the previous version; they might have changed slightly): 275x246 5mm and 195.5x96 3mm acrylic sheet. M3 stainless socket cap screws, 13 20mm, 2 16mm (13mm+), 1 35mm(23mm+); 16 nyloc nuts; 30 washers; 28 2p pieces; 10mm of 0.5mm wire through a 1mm drilled hole to lock the weight carrier; glue for the lid hanger (all other connections are with bolts, for simple assembly).
Lid attachment: solvent-weld with `Extru-Fix', after smoothing the base of the vertical part with coarse abrasive paper and clamping firmly to get the two pieces in contact.
Inkscape: The Inkscape setup mostly followed this from Makespace, except that the dxf export had to be with the "ROBO-Master" option off, otherwise the big circle was rendered badly (see this from nottinghack), and the line stroke was turned on just before printing, otherwise there seemed to be a problem keeping the colours when importing into Lasercut.
(c) Peter Sewell, 2015, 2016. Released under a Creative Commons Attribution + Noncommercial license (BY-NC).