Tomefs, I have a 2285B with the stock cabinet and would be more than happy to provide you with any info or photos you may need get your questions answered. I have no idea what model cab is on my 2285B, but it is wraparound with bevelled front and I have always assumed it was a WC-22.
Let me know how I can help.
PS! I have noticed that you varnish/lacquer/shellac (or some such surface application) your cabinets: I believe you may be able broaden your market by offering an unfinished cabinet, as an oiled/waxed cabinet is much simpler to maintain than one with a surface finish. Case in point is my WC-22 (?) - it is somewhat faded in one spot, but there is no way I am going to strip off the finish to fix it. However, if the cab had been oiled, it would have been extremely simple to re-fresh the finish.
PPS! My buddy needs a cab for a 2385 (WC-123, 124?). Let me know if you supply these.