stuff like that can be easily done but the results aren't that great, I start all maps for scratch, using no other models them my eyes (most of the time). If it would have been that easy , I'm almost sure most maps would be already released and not only 3 of them.
The maps aren't a "dump" of the N64, it's more like a remake, even if it almost looks identical. Some of them took me time to try to recreate. Just like for the Area 52 where I just ran in a bug that I don't seem to be able to get ride of right now so far.
For those who are wondering, I've been working back on the GE facility to fix some bugs and to finish it for the mod beta release deadline. I will prolly update the PD Felicity at the same time as this bug it fixed (since I used the GE one to do the PD one, I have the same problems in both.
Don't worry, the Felicity will still be the next map to be released.