You can see my BW-14 booting CP/M 3.0 and loading WordStar here:

https://i.imgur.com/BGjskX4.mp4

The 75 and 17 sec delays in MAME seem a bit excessive smile

18 sectors per track is cramming things rather tightly. As for gap sizes, this is what IMD comes up with:

[Linked Image from i.imgur.com]

You can watch the output of the probe2.com utility here: https://i.imgur.com/SM5SaM0.mp4

The 22disk definition (which appears to work) is

Code
BEGIN BON2  Bondwell 14 - DSDD 48 tpi 5.25"
DENSITY MFM ,LOW
CYLINDERS 40
SIDES 2
SECTORS 18,256
SKEW 2
SIDE1 0 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17
SIDE2 1 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17
ORDER CYLINDERS
BSH 4 BLM 15 EXM 1 DSM 174 DRM 127 AL0 0C0H AL1 0 OFS 2
END


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20