I have an '00 MariStar 230 which is pretty much the same boat but without factory tower and ballast.
I believe that your engine options for 2001 were still both 5.7L GMs. One will be the TBI which IIRC is 310 HP and has a small round spark arrestor on the top. The other is the LTR which is 330 HP with a large cast aluminum intake plenum on top. The LTR is obviously more desirable for its additional 20 HP. I'm more familiar with the LTR since that's what mine has.
On the LTR there was a recall for alternator bracket failure. If you don't have a bracket on the front of the alternator (Rear of the boat) like this:
then the recall service has not been done. The recall is no longer in effect but part is like $12 at this point and easy to install yourself. I'm going through this right now on mine. The recall had not been addressed and my alternator broke off 2 weekends ago.
There was also a recall on the monoleaf trailer springs which I think affected 2001 year model trailers too. This one is still in effect on all monoleaf MasterCraft trailers so you can get the springs replaced with a traditional multi-leaf pack for free if it hasn't already been taken care of since it's a major safety issue. The monoleaves were breaking off. I had mine done last year shortly after buying the boat.
You will have a Hurth V-drive/transmission combined unit rather than a separate v-drive and transmissions like a lot of V-drive boats have. It will likely be labeled for ATF but don't be alarmed if you find 15w40 motor oil in there. See the attached service advisory from Indmar. I opted to switch to 15w40 and it did make it a bit quieter.
I'm sure I'll think of a few other things.