DIY Jumper Suggestions

How about pre out/ amp in jumpers for integrated amps (eg NAD)?

use solid copper wire 8awg links. Most of Home Depot stores won't even charge dime for those 2 tiny little links.

I would go with the same brand cable.  I had bad luck mixing speaker cables on a pair of bi-wired speakers.  The mids and highs seemed disconnected from the bass.

Cool !  Will report back.  Mitch:  stacking spades is no bueno?

Avoiding spade stacking is just my preference so I don't end up with bent spade connectors.  If your plan is to do it once then leave it alone, stacking them should be fine.  I move stuff around too much so don't like to be bothered with it.  Since I make all my own wire now, I connect everything to two spades at the amp end.  Just made a set of bi-wire speaker cables with 2, 9awg runs to each speaker so needed to connect 6awg of wire to a single spade at the amp end.  Furez spades from Douglas Connection worked great.  I used Furutech at the speaker end.