Here is a pic with bolt tags at spots it will be bolted down.

The bolts will be to the left of the tags,I also prestressed the frame an 1/8 inch from side to side to keep the center pulled up with out having bolts in the middle of the floor.
Where the nose hits the floor there is a 2by 4 across the box to help stiffen it ,same in the rear,(inside the box,
It pulled down well ,and also the 2 by 3 11 gauge tubing is extremley stiff
Ron