The kit has many custom fabricated parts that took countless hrs. The kit is installed and functioning perfectly. To replicate that it would take alot of work. Buying the kit alone from Frybrid is an experience. You will plunk down $2k and not hear another word for months. When you do get the kit, good luck. It will be supplied without components and without any provision to actually mount it. In the 124, the job is very difficult to do right.
I will probably let it go with the kit for $4500 and $1500 without. Theres an additional $1k in parts alone to install the kit, nevermind a 100 hrs labor. The kit is very well designed, these components do not wear out (no plastic crap valves or anything else to wear out).
Fly down from NY, I will give you enough clean filtered wvo in clean cubbies to drive it home without involving OPEC