It's funny, I used to have very specific details regarding this very topic ... up to and including years ago, a photoshopped example of what it would look like. But tastes change, and new items and options become available, so my 1987 signature is quite different from my 1998, as is my 2005, etc.
The current build in my head is (still) based on a Precision, with an A-width flame maple neck, it still has a zero fret, and it is still a P/J.
It is most likely still Olympic White, with a matching headstock.
The 2020 version is finished out with a white bound and aged-MoTo blocked maple fretboard, Gotoh vintage Resolite clover tuners, a set of Monstertone tappable pickups w/ push/pull volume knob switching for the tap, with a Stellartone 6 rotary control, all mounted on an aged MoTo pickguard. The hardware is chrome with flat top knobs and a cover over the Precision pu, the bridge is a KickAss, and it sports a set of Dunlop strap locks.
The best news is it weighs in at just 8lbs, balances perfectly on the strap, and sells for $500 in a padded Tweed gigbag.
Impossible, you say? Not so. Because in the same scenario that I have a signature bass released ... I am a stinking rich, world famous bass god, and in my benevolence, I subsidize the remainder of the cost so that people can afford to subscribe to my personal vision of perfection.
You're welcome.