What cad program did you use to draw up the cart? Always looking for free and easier.
As Rod mention the IMIG-205 will not fit, but almost all other non roll-around Everlast units will. The IMIG-205P will fit fine.
Inthefrey's cart:
I would move the wheels forward (middle of the tank deck) and extend the tank deck a little like others mentioned. Larger tank (if TIG you will see soon) and better balance.
Rod cool new cart:
I wouldn't use wood, that stuff will catch on fire not that I would be that close with the torch..

Fire proof would not probably heavier than angle or tubing. Though probably cheaper.
I have to admit it works. Also, at my age squatting to set the dials it out too. Needs a shelf.