Welcome Aboard from Floridua !
Sorry, Can't help with plans....Do a google image search for a flat bed you like then start building.
I found this pic on-line, The company wanted $8 G for one !
I used that pic to design and built this one for $1200;
Assuming you were speaking of a steel flat bed......
__________________
93 Jeep XJ
88 Buick La Sabra
Toys;
88 TA-GTA in the works....
97 GMC Ext. Cab
502 Crate 5 Spd......Sucks Gas But Haulz Azz !
The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic.
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!