Hey there, for those who didn't already know, Persona's run of the first castle has been posted to a couple places:
Combovideos.com and
Fileplanet.
Both sites require registration, but it is WELL worth it. This is a multi-segment 100% (or 100.3% or whatever it is) speedrun which uses no glitches and takes no damage. The time is 1 hour and just under 11 minutes...simply incredible to watch IMO.
EDIT: Actually, looking into it further, there is one major flaw in this run: Persona didn't know that you could keep doing the bat's shinespark-thingy without stopping. He estimates it could have saved him 5-6 minutes...other than that, though, the only mistakes are extremely minor ones.
Also, he is currently about 80% done with the inverted castle but doesn't plan to finish it anytime soon. He says if he ever goes back to SotN it'll be to do a Richter run.
-Josh