Squire and Anderson formed the band - they are (were) the core and they are in your list there.
However, the classic lineup was with Bruford on drums. :-)
(Correction to my previous comment - it was on ebay I saw it.)
I contacted him last week because I was wondering if the body would fit a neck I have and he responded to say no it wouldn't.
The descriptions says that the bridge pickup is routed for a Bart.
Seems straight-up to me.
I'd looked at that BLX 80 head, as I've got a combo with a noisy amp; unfortunately, mine's tweeter has gone too, so probably not worth spending money on.
(And I've got an Elf, so don't really need another amp.)
I was quite taken by this BC Rich copy which appeared on the "Also viewed" list.
https://www.ebay.co.uk/itm/Custom-build-B-C-Rich-Ironbird-copy-4-string-fretless-bass-guitar/282870786790?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D43781%26meid%3Dd2f20eb782ee4c50b4e702e84f6a3815%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D112853900874%26itm%3D282870786790&_trksid=p2047675.c100005.m1851
(Apparently its maker has been certified.)