Wiring up from a PDB to a fuse block

[Turbogus]

Howdy Gang,
In the process of doing the blower motor upgrade I'm making a major safety change with my under hood electrics (fog and driving lights primarily) and I've been using a power distribution block

that feeds from a 4 gauge battery cable to smaller gauges that I'm using individually fused and relayed to various circuits.

My question, (sorry for my ignorance) can't I feed the 4 gauge into a covered automotive type fuse panel and eliminate all the individual inline fuses? If so, how would I attach the hurkin 4 gauge to the 'hot' side of the fuse panel. Is there such a thing as a reducer for wire?

Any help with this would be greatly appreciated and a hearty lift of the ol' lynch lid.

Gus

 

[Turbogus]

Update: I think I've found what I'm looking for I've just got to adapt the primay wiring;