I own a center post setup (not a cockpit, my own build) but I think if you build a cockpit design you are going to have to change to a crossover design due to perception, at the very least. In reality the center post doesn't inhibit anything while driving (unless it is huge) but getting in and out would be a pain. Yours also looks fairly non-adjustable. People also think their legs will hit it or that they can't left foot brake which is baloney, but in this world, perception is reality whether it is true or not. Regardless, the getting in and out part is important and customer perception is important.
Since cockpit owners really don't care about storing the unit, using a center post system is not necessary. The extra bulk and large storage footprint doesn't matter. For the vast majority of racers who don't have dedicated gaming rooms that they can place these monsters in, center post designs are superior due to their range of adjustment and small storage footprint combination that no crossover design I have seen can touch.
It is really all about your lifestyle, gaming area, budget, and your significant other as to what type of system is best for you but if you plan on selling a cockpit, the crossover design is the way to go. Just make sure you incorporate wheel tilt angle, wheel telescope, wheel height (all three independently adjustable), pedal rest angle and footprint big enough in size to accommodate high end pedal sets (saw thread where guy was hacking up his thrustmaster pedals to fit the Human racing Cockpit), seat slider and seat tilt angle adjustment, and ambidextrous shifter mount.
None of the current cockpit systems available I have seen have this total package w/o looking like monstrosities; like that thing someone else posted a link to earlier in the thread (wow is that thing ugly). If you have all these features while maintaining the sweet looks, you will have the best cockpit available and it will probably cost about $2K to build and ship unless you like working for less than minimum wage or have a serious manufacturing facility. The cost to build becomes the rub because there is no economy of scale. Very few people buy these things and there is a lot of competition. Plus, they weight a ton and are costly to ship.
On thing is for sure, the machined aluminum is sweet looking. I would take those looks over the plastic looking Human Racing GT chassis and any of the ugly square tube cockpit setups any day.
