this is my solution
THE SEAT..
I got a seat from a Ford Falcon ute as its the same style as the front and lines up with the front seats, it is fully reclinable and has a fold down arm rest to make cruising all the more comfy
THE FRAME..
I had to raise the seat 150mm to get the correct hight and to give me a space to mount the play station, inverter, amps ,tools etc etc
I made it out of 25x25x1.6 shs and made sure that it was bloody strong
Where the seat and belts mount i have welded in some 6mm plate and also where the frame bolts to the floor, and more under the floor
Its not going any where
THE BELTS..
I had some new old stock mitsubishi retractable belts sitting in the shed
so they go employed to hole the kiddies in place, i used a falcon lap sash for the center
I braced the body with 2mm steel plate and the used som 50x50x6mm plate with nuts welded to the back to reinforse all belt mounting points
Then tested it by swinging my 100kgs of it, no movment
THE END RESULT..
Now that its in all i need to do is get it engineered and then i can start to trim the sides and throw in some carpet








