Welcome RichardP,
If you like the floorplan, you should really like the over-all rig. PCs are well made, better than the typical "C". If you decide to special order a particular model, be sure to ask others on this forum having the same model, what they wished they had done differently. PC-USA will make modest deviations from what is considered "standard" without gouging the buyer. Radical changes might get costly, or simply cannot be done.
Someone mentioned reversing the position of your heads. That might cost you nothing at all. PC-USA is a great company to work with. They aim to please without pick-pocketing you.