It would be great if you could post some pictures of your ride. I would be very interested in the camera system - but I suspect a ready made system would be too costly for my Sequoia, even with 4 cameras or so, I googled total vision products and the site was very disappointing - no pictures, videos, or specs!
But I'd love to see this camera system working. Where are they? pedals, suspensions, roof and what not?
BTW, the specs you're going for look overkill, I would only question the sound blaster fx-i (lot's of driver issues and sound quality wise there are better options) - unless the aim is gaming (due to EAX), I see no reason why an on-board/usb tascam unit wouldn't be more appropriate. Steering wheel control you have to check CarPc Joycon EX, just search this forum.
Edit: duh, after googling baja camera system...I found this.