avoiding using relays??

If everything is fused and the switches are also overkill on amperage capacity where's the fire hazard

There isn't one. The stock stuff couldn't handle the amps. That doesn't mean that switches that could carry the load can't be installed. BUT....how cobbled up do you want your car to look??? We could bolt a few 60 amp disconnects on your dash.....I'll run 40 amps through #8 wire all day long, what is this going to look like? The DeLorean from back to the future?