I'm certainly interested, and I might have a couple of friends coming along for the ride if this turns out to be a proper RP. I'm going to throw in my two cents here.

First of all I think it's going to be a heavily GM-driven RP the moment we're out on a mission, but there may be ways to facilitate the job a little. With most mystery RPs I've seen, the LAST thing you want is a PC controlling an NPC that conveniently knows the exact time and place where mothman will show up again. Preparation is key. Sure, you could do all of the NPC posts by hand, but if I was running it is plan out the entirety of the town, point out the main locations of interest, and then have notes of the NPCs present and the info they hold. When we split up to go clue hunting I would PM the relevant players the information they will inevitably find and let THEM do the work controlling the scene and the NPCs inside of it. Instead of having to type out page upon page of dialogue, the GM's job is narrowed down to making sure the players stick to what they were given. It also means that we can pick up some clues in one area that make no sense without the info from another area. As GM, you can easily interrupt scenes and throw a wrench in the plan by adding hostile NPCs or other events that will stop the PCs from gathering enough information, like an angry drunkard who insisted there is no werewolf and his daughter was murdered or a PC failure just as the local journalist brings up her notes on the aliens.

Secondly this RP feels like a small cast sort of deal with closed signups. If we're going to be doing part of the introduction in the RP itself and we're a set organisation of independent monster hunters then a smaller cast would speed up the dreaded meet and greet, whilst the closed signups after a set point prevents newcomers jumping in when we're midway through chasing down a mummy or something and saves us the hassle of getting them settled into the team, figuring out their role, ect. It looks like CS checking might also be a little stricter to ensure our supernaturals in the party are well balanced.

Finally, I'm all for a scooby doo gang style independent group of investigators, but I feel like they have to at least be working for some higher power who probably doesn't give two shits about them. After all, what are we going to do with the things we capture? Who's going to clean up our unprofessional messes? Who's silencing the press? I'm thinking of a bounty hunting type of deal where the government pays big money to those who bring in the beasts for experimentation, alive or dead, with the promise of tying up loose ends under the condition that we alone must do the dirty work. Their complete lack of affiliation to our group except for being our form of salary maintains the difficulty of a private company prying into sensitive issues but also gets rid of the logistics that will be bothering us once we actually catch the bugggers we've been looking for. Furthermore the presence of nonhumans in our team implies a moral dilemma - if it's well-known that the government experiments with these creatures, most likely inhumanely, what do we do with the ones that aren't obviously dangerous? Sell their safety and their body to science for a few bucks, or try to mcguyver a solution that'll keep these beasts away from society before lying to our benefactors and saying it was a dead end? Will the government always believe us?

I'm just throwing ideas out there. If we have a good cast and a dedicated GM, this RP can really kick ass, but I feel like it's going to need a bit of work on the GM's half and some trustworthy independence from the players.