Welcome to
Before jumping right into how best to fit what tools onto your future mod, maybe you could let us know re the following tools you want to add onto Huntsman?
Or these are the only tools you want on your mod?
Spydernox
Electrician's blade
Pliers
Hook
full-size scissors
Scale tools: Tweezers and Pen
A) Depending on your answer to the previous question, most are very doable, except fitting the small Spyderco blade. The easiest route usually is finding the right 'tools' from existing chassis, then figure out a way to retrofit them together. Pliers/Hook/Scissors could easily be found on many models and easily put together.
Electrician's blade is not too commonly found on 91mm, I think currently in production knife would be XLT but that is an expensive chassis to sacrifice just for a mod(personally, YMMV). Another way is to find a 91mm Master Electrician(discontinued model, once offered exclusively from SMKW) and take the Electrician's blade and pliers from that chassis.
If you could find Master Electrician 2nd hand and combined it with the Huntman's tools, I think you would pretty much have the mod you want, except the small Spyderco blade.
B) I would recommend reading some tutorial from the stickies, Gareth has put together a really good one which covers many aspect about SAK modding:
https://forum.multitool.org/index.php/topic,43303.0.htmlAnd you could also find my
step-by-step guide for 91mm mod there.
Good luck with your mod!