Quoted from woody76:

sell the playfield and parts and move on. you will have way more time and money in that thing than it is worth.

Quoted from dung:

Pretty much this. Unless you want a major headache of a project with little financial upside.

Quoted from woody76:

if it was a better more desired game.

Quoted from robotron911:

I think it may have been awhile since you've bought plywood. Good, furniture "A" grade plywood is usually at least $100 per sheet and I doubt you would be able to build the cab with less than 2 sheets. Lower quality plywood has voids and knots, etc. All of which takes a ton of time (sanding, fiberglass, bondo, etc.) obtain a smooth painted surface. You can shortcut a cab that will be decalled with laminate-backed plywood, but it chips easily when cut and doesn't always provide a perfectly smooth finish (I learned that the hard way and don't use this shortcut any longer).
I have built my own cabs. Done properly (no cheap Home Depot plywood, automotive grade HVLP paint job), I haven't been able to do one for under $400. And that is before another $250-500 for decals or stencils and paint. A really quality stencil and paint job is higher than $500.
Now add in legs, plates, rails, etc. and it really starts to add up.