There's been several threads about it, none too fruitful.

We all love Eddie Hazel and the Maggot Brain solo! But only the first two minutes have been tabbed, of course it is very much an improvisation but the beautiful thing would be studying precisely that

The single Guitar Pro file available here now is a good starting point. I will probably first do the 3rd and 4th minutes to continue but my God I'm hoping someone else will also do a part.

Also for completeness' sake, we are discouraging lots of fledgling players from enjoying this solo by not making a tab.
So who's willing to help?

Thread from the Pit about the awesomeness of Maggot Brain
Older Tabtalk thread about The Maggot
GuitarGeek Thread on Hazel's gear

Phrases Label
The Bohemes
The White Strat w/Dimebucker
Tokai Explorer Korina
Ibanez RG570 Purple Neon
Gibson Les Paul Deluxe Ebony
Fender Telecaster Apple Red
Dano '59 Burgundy
Ibanez Artcore AM-73