WillievB That's quite pretty and possibly the best condition gallo I've seen yet!
Even so, I'd reckon it's more value right now as nostalgia and a player than a collectable (though one never knows!).
If it's got a high action, then setup as a slide guitar, no fretwork required
If you want to get it back into reasonable playing condition then maybe don't drop a ton of $ at a luthier but try DIY as far as you can. There's a couple peeps around here who have done fret levels - it's a test of patience rather than skill (though crowning frets is a skill to me).
You can always find a new blank to cut for the nut - I'd keep the original one stock as a reference. Tusq make shapeable blanks or perhaps you can find a chunk of prepared bone to use (though I find it fiddly to work with).