Ok So im gonna start building my welding car with my stick welder. can anyone tell me the dimension I should make the top tray for my 250ex to sit on and the aprox weight and diameter of a 150cf bottle and a 220?. I am paralyzed and in a wheelchair So there will be no lifting for me and I have to make sure my Dad can get the bottle out of the truck . Maybe a sling and an engine hoist LOL