Congrats on the find! It looks like that Rover needed the rescue. That is an interesting IIa as you have the Station Wagon roof but not the Safari (vented) top panel and I see a deluxe interior but a standard bonnett with the spare tire holder. As you probably know, no two of these are the same and it's always fun to see how each is different.
What is the last letter on the data plate? Mine is a B and it is a 64 (also starts with 244). Mine was so faded I thought it was an E at first but that would make it a 68/69 area.
The IIa solid front wings are going to be a little bit of a challenge to find as they are no longer made. You can put the later style wings (with the headlights in the wings) as they are much easier to find. Not having an engine opens you up to the many options of power that will fit, you can end up with a Rover that has some actual power!
64 IIa 88
94 Discovery
06 Toyota 4R (DD)
~Matt
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"Not all who wander are lost"~Tolkein