Where would I go to have custom axles made that would run at more angle than the stock axles?
Currie can build extended front axle shafts for you, that will still allow you to get the full amount of travel you want, while still operating 4wd.
This is very doable... but i would make sure you do it the right way the first time around. There is a big difference between a truck with 20" of wheel travel that isn't setup or tuned properly, compared to a truck that is done right that performs well with only 15" of travel.. I would much rather have the truck with only 15" of travel.
Also, if you do it right, it'll cost you a ton of money... like in the $8-$10k range. Like DE said, on top of the $3500 the guy quoted you for the kings and the upper/lower arms... you will also need new tie rods and brake lines.
I'm assuming you will be running a upper uniball and hopefully a lower uniball too. In that case, you will need a new fabricated spindle to accept the upper and lower uniballs.
For $3500, I hope it replaces the torsion bar with the king coil overs. Cause if not, the stock torsion bar isn't going to give you hardly any travel. And if you run the King coil overs, you have to have a tower/shock hoop that is strong enough to support the whole front end of the truck, plus the force of jumping/off roading. You will need a lot more than just a normal shock hoop... you will need an engine cage hoop with a lot of bracing and support, because if you ditch those torsion bars... that is all that is going to be holding your front end up.
You have a lot of options for the rear end, but if you want to match the front ends wheel travel you are going to want at least long travel leaf springs like Deaver. A correctly built 4 link with coil overs will provide even more travel.
Tires is also an issue... just by putting longer arms on, isn't going to give you more clearance. A long travel suspension is totally different than a lift kit. If you want to clear 33-35" tires, you will have to run fiberglass fenders in the front, and either pull your bedsides or run fiberglass in the rear too. If you want a long travel suspension.. and you also want to run big ass tires, you will have to incororate a drop down subframe to lift the front end, while still using the longer arms.
Also, if you plan on jumping the truck a lot like you said, it would be a good idea to add a bed cage and a in-cab roll cage for safety. I've seen high roller pre runners launch on dunes and land on their grille, face first.. and if you don't have a cage or a 5 point harness, you will get hurt bad.
Anyways, you have a lot of options. But if you do it the right way and want 17" + of travel, you will end up spending a lot of money.