Sanjay, here is one I just had built for my 225. It's 71"L x 31"D x 40"T made with 2 x 2 steal tubing. It's going to be sprayed with truck bed liner (Line-x) then wrapped in something. I haven't made up my mind as to what yet, but it can be changed anytime I want. Inside space when done will be 67"L, 27"D, and 36"T. The cutout in the top/middle is for the drain line. The large middle opening is so I can get my sump in and out without sliding it out the end.