Welcome, Vaner. Only you can decide whether your experience in other areas will be good enough to help you build a guitar, but I'll try to give you a few guidelines. First, get Melvyn Hiscock's book - he covers all the basics - tools, materials, wiring and finishing on three classic designs - a set neck (like a Les Paul), a bolt on (Fender) and a through neck bass. He talks about all of the geometry that makes an electric guitar playable - neck angle relative to pups and bridge. Yours will be further complicated by the multiple scale lengths and different string gauges. I don't know if you have drawn your plans or if they are of some existing instrument but you will need to buy or make bridge and pickups for your configuration. If you have to make an 8 string angled bridge with the correct intonation can you? In fact, if you have drawn the plans yourself, do you understand scale length, string tension, and intonation?
The body is usually pretty simple - you cut it out with a band saw, route various cavities for the neck, pups and wiring, and carve the top to shape. Whether you want to try this on an expensive piece of wood is up to you - if you haven't done much routing or three dimensional carving you might want to practice. Binding the body is always tricky for a new builder - channels need to be routed, bindings bent and glued in place. There are special tools that make this easier and certainly practicing on scrap is advisable.
Carving the neck is another task that newbees find tricky. It is helpful to make templates from a neck that you like - but that is going to be hard for your configuration. Setting the neck angle into the body is critical for playability - that relates back to the design geometry I discussed in the first paragraph.
Next critical operation will be mitering the fretboard - again made more difficult by your fan frets. The thing to remember here is that if one fret is a few thousands off your guitar will play out of tune and there is no simple way to fix it. Hammering in frets is pretty straightforward, binding the fretboard adds another layer of difficulty. Again, not impossible for a first timer but also not easy.
OK, you get the wooden parts all made, the next thing to consider is any inlay or special touches. Fretboard markers can range from simple dots to exotic pearl or wood inlay, as is the headstock inlay.
For the home builder it is almost impossible to get a finish that looks as good as a commercial guitar. There are dozens of different finishes available - in general the better they look the harder they are to apply (and/or take special equipment). I happen to believe that beautiful wood deserves the best finish that you can apply. Are you prepared to do this?
For me wiring is a snap, but I'm an engineer by training. If you use a common wiring scheme you can buy all the pots and caps and switches - if you want something special you need to understand how that stuff works. Again, soldering and shielding aren't hard - just gotta be done right.
Last, and far from least, is the final assembly and setup. Frets need to be dead level and crowned, relief adjusted just right, bridge saddles set for height and intonation, and nut slots cut for the string gauges you will use. There are some special tools here - fret and nut files in particular.
Can you do all of this? Of course you can. Should you expect perfection on your first? Probably not. You are going to make a significant investment in tools - why not build a conventional guitar with the same kind of neck and body (ie set neck or whatever you are going to use on the 8 string and drop top or carved top or whatever). Play that guitar as a backup or give it away, then build your dream.
FWIW - here is a very long thread on my first and only electric build. It is a pure clone of a 57 LP. Remember that I had built a dozen acoustics up to this point so necks, fretting, finish, setup, etc were known and I had a pretty good collection of tools. Think about doing each step in this thread - are you ready to do it to your nice piece of wood?
http://www.harmonycentral.com/t5/Electr ... p/31808721
Good luck, let us know how it goes.
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(although I have a lot of experience with power tools working as a panel beater)
?adma