Here's an idea; I'm not sure exactly how well it might work out, but it's a thought. First, take lots of pictures of the interior. Measure the size of cabinets, countertops, etc. Then, go find a regular cabinetmaking shop that does work of high enough quality to meet your standards. Tell them what you want, and invite them to come into the boat to take measurements, etc. Perhaps you could get a better price on cabinetry/installation this way, and then just have a little work with headliners when they're done - and there are always plenty of places that do auto headliners who would like a little extra work.
I'm new to all this, myself - how's it sound to the rest of you?