Wow! thanks for the speedy and detailed response.

Yes, all the cracks are thinner than 1/4 in.

To clarify, when I used the term "bulging" I now know I meant the
plaster was pulling away from the lath. That occurs in one noticeable
spot along a 4 ft crack.

Some of the plaster effects in my house are curved and appear modified
during the Art Deco era, so yeah, not going to drywall the entire
house.

I'm going to start small and work from there.

thanks,

Don