You did good. Needs a lot of work, obviously, but it's a great start.
Are you planning to do the engine tear-down and reassembly yourself? I've had mine apart several times, and I can advise you on gotchas that you need to be aware of.
I've also got some Classic Mechanics magazines with a couple of great articles on Enfield twin engine work that I can scan and email to you.
There are a number of oddities in these engines that you need to be aware of, and a couple of worthwhile re-eingineering tricks that make them more reliable and less leaky.
And I do have a good transmission outer cover with gearshift lever return spring and kickstart shaft and pawl that I can sell you. I'm working on setting up a paypal account to facilitate selling of my surplus stuff.
I'll also take a look at my collection of primary cases and see if I can find a good set. (I have a few that would need welding to make usable) I may also have clutch parts, but I'm not certain of that.
Follow that link for the gearbox cover on Hitchcock's and you can backtrack to the original parts manual. I think the one I started with is a 1959 Meteor, so you'd need to look for the 1957 Meteor book to find your engine.
They switched back and forth between the pushrod actuated clutch and the scissors type several times over the years; my 1959 model has the scissors clutch.
btw, judging by that blue gas tank in the background, I'm guessing you have a BSA project going on in your garage as well.