Steven,
I'm not sure about the brake lines and power steering lines. However, when changing from front leaf suspension to front coil suspension, I have read a few threads on forums mentioning the need to change the power steering gear box from 1999 - 2004 to the 2005 - 2007. I looked on Ford parts website ( fordparts.com ) and it shows different part numbers and weight, but photos and dimensions are the same. I would contact Red Head Steering Gears in Auburn Washington. They are the experts. Evidently they developed a proprietary process to build bullet proof steering gear boxes. Ask them if the steering gear boxes are different between the 1999 - 2004 and 2005 - 2007 model years. I would also search the internet for aftermarket hoses. You might check with DieselSite in Florida. For brake lines...not sure about that. For brake lines, I would recommend Crown performance.
This thread caught my eye because I have thought about building a 2002 Ford F350 Crew Cab 4WD.....setting the cab, front clip, bed along with 7.3L engine and 4R100 transmission onto a 2005 - 2006 chassis, frame, and suspension...and installing a Carli 4.5 inch suspension system. I previously owned a 2002 Ford F350 Crew Cab 4WD SRW ( LB - 172 ) and I think it had just rear anti-lock brakes...although I might be mistaken. I now have a 2006 Ford F350 Crew Cab 4WD SRW ( LB - 172 ) and it has front and rear anti-lock brakes. This truck has all the parts and upgrades offered by Bullet Proof Diesel. It also has a BTS ( Brian's Truck Shop ) built 5R110. It would be interesting to learn and obtain information about converting rear anti-lock brakes to 4 wheel anti-lock brakes. No doubt there are threads discussing this change.