Cabinet makers are not all competent. I had one build two cabinets for a pair of 3-way speakers. As requested, he used Baltic birch plywood to build them. But he veneered them using carpenter's glue rather than contact glue. One spot on top of one of the enclosures got unglued after a short period.
That's not all. When I installed the drivers, I noticed that he had done a sloppy job with the interior bracing which I had clearly specified to him. Those enclosures had cost me over $3,000 to build and were designed to be sold for more than $7,000. Their performance was outstanding according to several audiophiles, and some audiophools as well. I am sure that, if someone pays a high sum for speaker cabinets, there is a temptation to have a look at the interior and see how they were built. For that flaw in the interior construction, I couldn't sell them with a reasonable profit margin.
Someone should make sure of the quality of the work done by a cabinet maker before signing a building agreement.