Nowadays luthiers mostly dont know how to make archtop bass guitars (or they are just too lazy), because working with solid wood is easier and cheaper.
I'm planning to buy myself an archtop bass guitar (yup, again from Defil), they are still present sometimes at low prices (down to 30$ if its in bad condition, like no hardware). Sometimes I keep buiyng destroyed guitars, to keep the single hardware. Got an archtop guitar from '72 (electric, not bass) in low price (approx 40$) that had no hardware at all, and now waiting for better time, when I can finally take care of my stuff.
I would reccomend you the same - to buy the guitar body, and if you need something more special, order a custom neck and hardware at luthiers workshop.