NYWolf,
The guitar in the e-Bay link is quite a looker and quite a price which might explain it's lengthy run on eBay.
Here's some data from my 2000 Westerly built X150D. You can see pics of fit in
this thread
Fretboard Radius 12"
Neck depth (a little hard to measure without a profile gauge and calipers but I'd say at the 1st fret wire where the curve from the headstock ends it would be about 13/16" or 7/8" from the center of the fretboard.
I would characterize the neck profile as oval.
Neck width at the nut - 1 11/16"
Neck width at the 14th fret body joint 2 1/8"ish
E to E string spacing at the nut 1 7/16"
E to E string spacing at the bridge saddle 2 1/16"ish
There's room enough to cut a nut with slightly wider string spacing and reslot the bridge saddle a bit wider needed
Weight - I'll set it on the UPS scale at work on Monday but low 7lbs seems about right.
Body depth at the rim 3 3/8"
Body width at the lower bout 16 5/8"
(Same body dimension as X160 Rockabilly from Westerly)
Note that the later Corona, CA built X150(D) as well at the X160 Rockabilly and X180 Park Ave which share the same body are all slightly smaller at 3" X 16".
I measured and compared my 1997 Starfire II and it's fairly similar but the neck feels/looks a little different than the X150D. It's not quite as deep. For some reason the fretboard binding on the Starfire II is taller by about a 3/64" so at a glance the neck just looks thinner.
The 1969 Starfire IV has the 1 5/8" nut width and I've been playing that guitar for over 30 years and am used to it. I'd thought the neck was thicker than either of the late century guitars listed above but now wonder if it just feels thicker in relation to narrower width.
I'm going to get have to get a profile gauge and get real data to share.