Mike
I'm in the middle of restoring a pair of early 3as much like yours, but maybe not starting off in as good a condition.
Like it or not, the premium-priced AR-3a are all in original unmolested opinion. Even though basic restoration seems like a no-brainer, the deep-pocked collectors are looking for 100% original speakers. If you're re-veneering, you're doing it strictly for yourself, rather than having any hope of re-couping your investment of time and money. A restored and attractive pair of 3a should be worth at least a couple-three hundred bucks, though, just from a utility standpoint.
My cabs had been stored in a damp place and the corners were starting to separate. I've routed out the edges of the cabinets on mine and am gluing in strips of solid walnut. It will be covered by veneer and invisible, except from the back. I figure the collector value's already shot at that point, so I'm completely replacing/upgrading the crossover and terminal plate, re-using only the original coils. Veneer will probably be mahogany, walnut, or cherry.
I'm limiting myself to those wood choices because PSA veneer is readily available in them in both 2'x8' and 2" edgeband configurations - this will let me use a single large piece of veneer for the top, bottom, and sides of both my AR-3a. The edgebanding will be used on the front.
If you're setting about restoring them, the recently released document "Restoring the AR-3a", hosted over on Classic Speaker Pages, is an absolute necessity.
Damn, I'd better like the way they sound.