I'm going to assume by "get off the ground" you mean garner enough players where you feel confident you won't be the only one posting.

First, I think it's important we actually look at your [url=http://www.roleplayerguild.com/topics/153051-fate-install-fate-stay-night-rp-based-on-the-mechanics-of-fate-kaleid-l/ooc#post-3959726]interest thread[/url] instead of make judgements based on hearsay. So here are some things I notice at a glance.

#1) The tread title is too long in my opinion. A shorter title will almost always get more interest than a longer one. "Fate/Install" is fine. "Fate/Install (Fate/stay night RP, based on the mechanics of Fate/kaleid liner Prisma Illya)" is too long and might actually stop an interested party from checking it out. As a Fate/Stay night fan, I get it's a FSN RP without the explanation. The goal is to lure them into the interest check/OOC subtly, not advertise everything. If you let people get curious, they will look.

#2) The first paragraph is mostly about what you don't want in the RP. We're trying to lure, not push away. If you're worried saying "Fate/kaleid" is going to draw in a bunch of magical girl/loli fans, strike it from your description. Don't tell me what you hate, woo me with how awesome this RP is going to be, and all the cool things I [b]WILL[/b] be able to do in it. That's what I want to see [b]FIRST[/b].

Having a lot of information for people who want to read it isn't a bad thing, but all the most important information should be right there. I think you struck a pretty good balance in this regard however. At least the post "NuttsnBolts" format looks that way. 

I would also watch fate stay night or unlimited blade works. UBW is an easy recommend since it's on net flicks and has really good animation. I would have a hard time taking anyone seriously if they didn't experience the original work or one of it's more popular variants. 

I do not think an interest check makes or breaks a role play, but I think it's a good idea. If your interest check isn't getting many responses, I'd consider looking at how your information is presented.