Has anyone made their own wiring harnesses?

I come from an aviation maintenance background and I was an electrician for a decade or so, wiring doesn’t intimidate me.

It seems, reading through build threads, that the supplied wiring harnesses are generic and require some disassembly and splicing, I HATE unnecessary splices, simply adds another mode of failure.

It looks like the supplied fuse-block is only eleven circuits with a few relays and such, I am seriously considering just buying some Tefzel wiring and doing it myself.

I appreciate all pros and cons.

Thanks in advance,

Steve