[PNJSNAK]

Paul
I guess it depends on what you are comfortable in doing and time.
Since you built two f5s in the past you have the capability.
You probably do save but you do the work.
I wasn't comfortable with all the brake line bending and Still working 40 to 60 hrs a week.
Even with getting the rolling chassis it still took almost a year before it was on the road.
If you plan on anything special with the chassis you may want to have control of all the parts. Also, if you want specific brake components like Wilwood you don't want the rolling chassis. Not sure if Sonny will let you order special things like brake MFG.
The Granada fronts with GM calipers and Explorer rears were fine with me.
If you get the rolling chassis I would still go over everything they did, like squareness and making sure all connections are correct.
I think you will find a lot of the guys here did their own chassis builds. I did order the rolling one and it was done by Pete Clark at Fastimes Rods in Dunkirk, NY. He did an excellent job. Not sure if they outside this work like back in 2001.
I hope I didn't get to long winded.
I'm sure others will chime in.
Jim