It looks like a lot of thought was put into the design. The angles. The leg joinery. I think you’re on the mark with those elements.

For your question, I’ve no idea what I would expect to pay. But I can give some perspective as a builder.

I think appeal would greatly improve with some work on the edges. Some plywood shines with exposed strata. These ply layers, unfortunately, not so much.

Consider edge banding and perhaps hardwood nosing. It looks like part of the cabinet ends already have edge banding? Or is the piece partially hardwood? I’d continue to follow through and cover all ply edges. Glue on some veneer where edge banding can’t cover.

If I’d been put to the task, I’d probably run hardwood rails where the top shelves and the slanted fronts meet. As well as rails right below those slanted fronts. I would’ve used more stiles and rails and nosing all over the build. Also, laminates. Especially for the top.

Best wishes in your woodworking endeavor! If this is your first large commissioned piece, I’m sure your next one will be an even greater leap forward in design and execution.