Replacing factory wiring at this point?

[jkade]

How hard would it be to replace the factory wiring on a truck that is already done? The reason I want to upgrade is because I am adding a after market efi, fuel pump, electric fans, air ride, and it has a fairly complex audio system. I know I will have to pull the dash apart and I am going to be pulling the motor and trans and possibly taking the front clip off. Can I just add a seperate mini fuse block to run all this and keep the factory fuse block for what it contols now? Thanks in advance