Thought this would be some helpfull info for builders deciding to use the 720 Mod and choosing to mount pickups to the body or get the traditional route that allows room for the mounting screws and legs to float freely which allows for adjustment both higher and lower.
Got the lowdown on the long leg short leg dimensions from Rod of Skatterbrane pickups.
Im going with Skatterbrane Earthbrane paf Covered humbuckers and from the bottom of the leg to the top of the bobbin they are 1 1/8 inches tall or 1.125 inches tall or 28.57mm tall for the Long leg version,
Earthbrane Paf by Skatterbrane very sweet vintage Humbucker:
http://www.skatterbrane.com/pickups/earthbranes-pickups.php
Skatterbrane pickups with cool user submitted sound clips are here:
http://www.skatterbrane.com/customer-feedback.php
or you can get the short leg version which is 7/8 inches tall or .875 inches tall or 22.22mm tall for the short leg version.
Since the humbucker pickups mounted to the wood cavity route is 3/4 inches deep or .75 inches deep or 19.05mm deep it will be good to know which version to buy ...ie. (Long leg or short leg) as you can always raise the shortleg version up but you cant lower the long leg version down unless you remove wood from the body in the pickup route itself.
that info is noted here:
http://www.warmoth.com/Guitar/Bodies/Options/PickupRoutingOptions.aspx
the 720 Mod drops the neck down so that only the fretboard itself is above the body, Warmoth states that their fretboards measure .25 inches thick or 6.35mm:
that info is noted here:
http://www.warmoth.com/Guitar/Necks/FretboardExtensions.aspx
..... then of course you add your fret height to that, which in my case Im using the SS 6150 fret wire which is roughly .047 inches tall or 1.2mm:
you can check your fret wire height here:
http://www.warmoth.com/Guitar/Necks/FretSize.aspx
thus adding the fretboard thickness of .25 inches or 6.35mm to the fret height thickness of .047 inches or 1.2mm yields = a combined thickness of .297 inches or 7.55mm.
thus I now know that from the top of the guitar body to the top of the frets is no more than .30 inches or 7.55mm high.
being that the wood mount pickup cavity route is 3/4 inches deep into the body or .75 inches deep or 19.05mm deep and the fretboard and frets rise above the body by .30 inches or 7.55mm I can add these two figures together which comes to roughly a little over 1 5/16th inches or 1.05 inches or 26.60mm combined.
add in the height of the strings above the frets lets say the same height as the frets themselves .047 inches or 1.2mm and you get roughly 1.10 inches or 28mm from the bottom of the pickup cavity route to the bottom of the strings themselves.
then going back to the long leg and short leg humbucker dimensions you can see which will be closest to the strings without going so high that the pickup touches the strings and they cannot be adjusted for your wood mounted purposes.
thus the long leg version is 1 1/8th inches tall or 1.125 inches tall or 28.75mm tall where as the shortleg version is only 7/8 inches tall or .875 inches tall or 22.22mm tall.
So the pickup will be very close at the neck humbucker with the long leg version but maybe perfect......with the slight neck pocket angle that Warmoth incorporates into the 720 Mod.
Im also using the Hipshot hardtail Bridge and am opting for the .175 thicker baseplate model as Im thinking I shouldnt have to raise the string saddles too high to compensate for the slight angle in the neck pocket route that is part of the 720 Mod.
heres the hipshot bridge and dimensions for those considering it:
http://store.hipshotproducts.com/cart.php?m=product_list&c=19
both the .125 model and the .175 model bridge dimensions:
http://www.hipshotproducts.com/files/all/6stg_fixed_dims.pdf
Both versions can be bought thru Guitar Parts Resource an excellent company:
http://www.guitarpartsresource.com/gbridge_hipshothardtail.htm
Stew Mac also sells the .125 or 1/8th inch thick baseplate model and they also show the dimensions by clicking on the spec section below the bridge pics:
http://www.stewmac.com/shop/Bridges,_tailpieces/Electric_guitar,_non-trem_bridges/Hipshot_Hardtail_Bridge.html
heres a conversion chart for anyone wanting to do their own math:
http://mdmetric.com/tech/cvtcht.htm