I just spent last weekend building one
Took maybe ten hours and all i have left is to weld the ramp, paint, and run the lights. Would have finished last weekend but ran out of gas.
Used a total of 180 feet of 1" x 2" .083 wall tubing and twenty feet of .120 wall tubing (for the ramp) Plus two sheets of 5/8" plywood
Total cost of the steel was $221 , $37 for gas, $11 wire for welder
Final deck size was width 8'2" length 7'6" plus 12" beavertail
pm if you have any questions.