I can't seem to find any bottle dimesions for Mig bottles. I am building my cart but I want to build it to accept a bottle in the future. Can anyone provide me with the width and height of one of these bottles?

http://www.pirate4x4.com/forum/attachment.php?attachmentid=203603&stc=1&d=1125549150

this might help you:

http://www.airproducts.com/products/fastfacts/charts_n_tables/indgascylinderdata.asp

Thanks that should give me a good start.

These are pretty standard sizes:

http://www.oxypro.ab.ca/products/coyne%5Fcylinders/coyne_cylinders_page7.jpg