Hi David,...what exactly you're looking?...and what do you mean about hangers?, most of the mesurements or plans i make is after i have the endplates , keyhead and changer temporary install to determine the lenght of the guitar make the bellcranks and align as close as possible horizontal with the raise and lower fingers on your changer,
here's some of the step by step i use because i don't have a full prove plans and templates set in stone yet...
1. i decide what kind of cabinet to build( SD, Double or 1 1/2 body ).
2. then build or buy the endplates and keyhead.
3. build the cabinet.
4. build or buy a changer.
5. fitting the changer in the cabinet and cutting the hole in the endplates or vise versa.
6. how far the changer is from the end of the cabinet will determine the total lenght of the guitar( i use a minimum of 2" from the center of the changer axle to the end of the guitar with the (endplates 1/4'').
7. once the changer is temporary install i screw the neck temporary and mesure a 24" scale.
8. then i build or buy keyhead and then temporary install the keyhead with the endplates .
9. with all that i can now know the total lenght of the guitar will be and can now cut the cabinet to the right lenght.
10. position and install the pickup temporary
11. now it's time to start on the undercarriage.
12. from there it's a matter of choice from the builder where to put what... like knee lever and pedals, position of cross shaft ect...
13. build or buy the legs.
14. determine the height with legs and install the pedal rack and cut the pedal rods to fit.
15. install everything temporary.
16. finish the cabinet.
17. buff everything to a shine.
18. reinstall and finish the guitar.
that is pretty much how i go about starting a custom building process.
![Wink ;)](./images/smilies/icon_e_wink.gif)
, i'm sure some use different process and will chime in, and i'm sure i will do some things differently once i have build a few more.
one thing i've learn is to buy or build your endplates and keyhead before making the cabinet, it's easyer to make change and fit wood with metal and aluminum than the other way around.
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
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hope this help, ...........Pat C.