You will probably not be able to just pick up an "off the rack" neck blank. First of all you are doing a neck thru design and most blanks are based on set or bolt on "common" sizes. The other issue that will make this a bit different is the 28" scale, not that Baratone lengths are unheard off just not as common. You really do need to accurately draw this up so you know what you need before you buy parts. The fretboard will probably need to be more like a 5 string bass blank (given your longer scale and 30 frets).
You really need to plan well for the neck. You will have a bit of extra weight at the headstock, 28" scale compounded with two additional strings will add a lot of tension, and I am going to bet you will be cutting pretty deep into the lower cut to get access to the 30th. fret. Do you know how thin of a profile you want on the back of the neck. Again I am going to go out on a limb and say you probably won't be using a nice fat boat shape, but thinner profile will weaken things also. You can probably work out the issues w/ truss and a couple of rods, similar to a 5 string bass. I would be inclined to use laminate stock, allowing you to use stronger stringers and orient the wood to quatersawn. Laminated material will resist twisting a bit better also (my opinion).
It's going to be tuff for a first build because you can't just go check another guitar for reference. You best do a lot of research so you know what you are doing. I really hope you are using drafting software. If you draw up what you are planning accurately you will have a much lower risk of making a major error.
Sounds like a killer guitar, Good luck!!!! Rich
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Well as far as making sure I wanna do this right, thats why I'm asking questions The body will be modded a little for the 30 frets of course, but I might just end up going with regular 24 frets, if so it will look like a regular RG pretty much. The profile I do want pretty slim and I had the fact it will be weaker in mind... but also was thinking about maybe two truss rods. About the neck also, I was thinking doing a multi-piece neck, not just a single piece of _____?? I was thinking of using Mahagony for both the body and neck, and since I said a multi-piece neck, what other material might work along with Mahagony? (If any) I hear Mahagony is pretty damn strong, I might not need other materials to strengthen the neck, but as far as building guitars, I'm no expert so I'll leave that to you guys who know much more. I will say this though, once I actually do get the wood etc... and I predict from the get-go I'll have troubles, I may take it to a luthier to get the neck made, making bodies are very easy for me so thats no biggie, but the neck... whew! I've never made a neck before but bodies I have. haha with "I've never made a neck before" said, taking it to a luthier wouldnt be a bad idea? lol BUT, gotta start somewhere right? Thanks for all the help!!