I have a '68 Bristol with a liner which ends at the saloon forward bulkhead as you describe. Yes, the rest of the interior is painted fiberglass which was never faired or improved upon beyond the laying up stage. I believe this is fairly normal for the cruising model. The dinette and weekender models may have different headliners since their interior is quite a bit different.
I've had a great time sailing my B27 and feel they are a great boat, and for the money an excellent value.
The bristol email list accessible through the quick links header at the top of the page is quite a nice resource for direct Bristol questions.
who is staring at the sea is already sailing a little