Lots of options here...
As spec'd out by you , I think that bass would have a list price of around 10,000$, if you include the gold hardware. Not counting the cost for a lager Epic body or the inlay at the twelve fret ( I think Mica's the one who can really tell you how much) I come up with 9290$ in the Alembic custom quote generator ; I used a rogue model as a starting point, as I've found out that it's a good one to start from ( unless you want front & back coco bolo, then a Mark King Deluxe is a good starting point in my opinion); as Mica pointed out in another post, the 1/8 inch laminate of ebony would add 450$, so that brings it to 9740$. If you order by the end of January as you know the coco bolo top is free, so that's not included in the price. The inlay at the 12th fret would likely be 200-300$ at least I think, but I'm sure it would depend on the complexity of it.
That's quite a bass. I wouldn't say there's much room for critique, as we all have our tastes to satisfy; I would , however point out a couple of things: A) the continuous backplate option, seems a bit of a waste if you 're not going to have a back laminate and B) Coco bolo looks great under a glossy finish. I have coco bolo basses both in glossy polyester and polyurethane satin finish, and I do like them both for different reasons...I like how the glossy finish makes coco bolo shine and brings out all the little detail in wood that you'd be hard pressed to see if it were just satin. Plus it looks great on stage if that matters to you; and I like how I can feel the wood grain under my fingers in my satin finish bass, and the understated elegant look of it.
Well, here's my take on it, I think you're on the right path
Good luck and have fun, I'm sure whichever way you go, you'll love it
Valentino