Some Q1 Maps Have Been Remade In Q2
That would be awesome. AFAIK no one has done it.
However, a few months ago I downloaded various versions of e1m1, e1m2 and e1m3 remakes for Quake 2. I don't recall where exactly I downloaded them from (was just a http directory listing) but I specificallly searched for filenames like q2e1m* etc.
Quick google search, I believe these were 3 of the the best I played http://www.3dgamersedge.com/spq2lvlrevs/q2e1maps.html
Also, somewhat related... I just recently discovered this amazing map for DOOM 2 which has an extremely heavy Quake 2 vibe http://www.moddb.com/games/doom-ii/addons/putrefier