I'm not sure that he has a website at the present time. Probably your best bet is to PM him.
Mark built a tank for my flatbed and I have nothing but compliments to say about him. Mark took pics as he built my tank and sent them to me and he can make a tank however you want it.
Outstanding service and product, you can't beat that.
Here's a
link to an album showing the tank he built for me.
Here's a pic of the finished product just so you an see what he can do.