You have a lot of stuff to get.

High Steer, Knuckles. This is what I would get: http://www.trail-gear.com/steering.html

Spindles. Marlin may have them.

Bottom Trunion bearing caps--can be hard to find. Marlin may have some; Trail-Gear is going to start making them.

Hubs for a solid axle

Rotors--go with FJ60 that way you can use the IFS calipers

Birfields and inner axles, I would go with the 30-spline Longfields http://www.longfieldsuperaxles.com/

Diff with gears and locker

Lock out hubs

All the nuts, bolts, and studs to put it together

The rebuild kit for the knuckles can be sourced from Marlin, All-Pro, Sky, Inchworm, or Trail-Gear. You can get most of the hardware (nuts, bolts, and ect. from those places also.

You can use the IFS wheel bearing hubs by buying a widening kit from Sky Mgf. http://www.sky-manufacturing.com/

There is another to do it by moving the calipers to the opposite side of the ears on the knuckles. I do not like it, looks "Booty Fab" to me but many people have had success with it.

What would I do, Find a complete axle and upgrade it. It will have the stuff you need that is not available aftermarket. Keep the housing you bought for a spare, you got it for a good price