Even the wooden enclosure could be done for significantly less. It's effectively a picture frame. There are plenty of standard box frame profiles they are very

Even the wooden enclosure could be done for significantly less. It's effectively a picture frame. There are plenty of standard box frame profiles they are very similar to what they have built. If it was me, I would have explored working with a picture frame company for final assembly, many are used to "assembling" products with extra components (think of stuff on Etsy). The frames are simply cut with a framing guillotine and stapled together. My estimate would be frame (including custom cut back panel), and final assembly would be in the region of $10-$15 at a US/UK framers. (Excluding electrical BOM)