Might be easier to go with an aftermarket sun-roof kit. I put one in a VW pickup once, no0t too bad an install. Kit came with a 2-piece frame and template and it was pretty easy to cut out the sheet metal. Then drop the outer frame down in the hole with sealant around the rim, then the inner trim/frame up from below and tick in the headliner and it was done.

It seems the hard part with the factory moon roof is that is is pretty much built into the roof, so would be a lot harder to remove and then you would need to make a template and figure out how to get it re-installed.