Hello, I am looking for help identifying and or confirming whether or not I should/could restore this greenhouse.

This is just an opinion - I'm no expert!
The skeleton looks quite robust - can't really tell how the newer struts were attached to the old, but it looks as if they're needed. You should be able to get the plywood off - hopefully, they're screwed on, not nailed.
And then what? Glass panes would be quite expensive, heavy and difficult to install. So I'm assuming plastic sheet. You'll need a double layer, with a little airspace between them, so probably secure it with laths and then more laths on the outside for the second layer, because staples will just rip out in the wind.
Could be too big a job, though. Could be you should consider keeping as a nice big workshop or storage space.

There's always polycarbonate panels but I worry there's dry rot. That wood looks really old. I think you would have to clean, seal and re-paint the frame (and possibly repair if you do find dry rot) after removing the plywood.

Welcome to NGA @Dostuff

If you decide to go ahead with restoring your building to a greenhouse, I hope you will come over to the greenhouses forum and share your project with us! It looks like it will be a lot of work - but then again, so is building a greenhouse "from scratch." (And you will certainly have lots of plywood for repurposing.)

It's a great shape and size. Good doors, looks like a ventilator hole above it for a little fan. Hydrocarbon panels will run to some serious money, but the restored building would be something really worth having.

Welcome!

You need to get someone who knows a lick about structural soundness. If the building is sound , go for it.

Did anyone tell you we love pictures here in the greenhouse forum?

I built a wood-frame greenhouse in 2009, with 6-wall (R 3.8) polycarbonate for the roof and 3-wall on the sides. The poly panels are very tough and long-lasting. The places to watch for rot are at the base of the uprights and along the edges where the frame rests on the foundation. Roof framing doesn't seem to be a problem as far as mositure.

When you pull the plywood off, you will be able to spot any trouble. Give the wood a couple coats of oil-base paint before sheathing.