Your favourite (non-boutique) bass manufacturer has contacted you. Due to your reputation as a bass player other bass players look up to, they want to make a signature bass model for you. This could be based on one or more of your existing basses or something you've always wanted which hasn't until now existed. You would have full control of every aspect of the specification and customisations. It will be distributed to the shops they usually sell in and you would get a royalty for each one sold.
In as much detail as you like, what would you tell them to build, and realistically how much would you expect it to cost when it goes on sale?