Man, a custom-made bass you've had for almost 20 years on the chopping block?
I understand the appeal of offloading for cash, but not for a trade, personally. Is this a case of, "if I just did ____ I could get it right now"? From what I remember, Alembics are in a different stratosphere price-wise, but I don't know all of the models, etc.
Is the Fodera the one or just the next one?
Edit: after digging, the price gap isn't what I thought it was. Still, a shop will give you a price that allows for them to make money. I don't know, I'd still shy away from that.