It IS possible to run IMAGE 1.2A BBS under WinVICE (I tested v1.19) using tcpser.
Setting up the BBS is fairly simple. First, you must copy all of the BBS files
from the two install disks (D64 images) to a D81 image using copy-all (on one
of the install disks). Next, you load"config",8,1 and configure the BBS, including
SB/UD/UX areas, access levels, etc. Finally, you load"modemconfig",8,1 and select modem #7
(the first 2400 baud Hayes Compatible on the list). The BBS is ready to boot now.
Everything seems to work fine except the BBS is not disconnecting users when
they logoff. :(
The BBS is configured to use four virtual 1581 or SFD-1001 drive images and
it will support 2400 baud callers. The year will display 1906 and the program
overlays take a while to load when you enter a command to load a new subsystem.
I would give this BBS configuration a grade of A- based on my test results.

Download pre-configured
BBS installation
The SysOp Account:
handle is sysop,
user #1,
login ID is NI1
password is image
name is John Doe
phone is (216)/788-1841
Instructions:
Download the file and unzip it. Unzip the
tcpser-1.0rc11.zip file (creates tcpser dir)
and then unzip WinVICE-1.19.zip (creates WinVICE 1.19 dir)
on your Windows PC in a folder called c:/bbs (or whatever).
Next, run the run.bat file in the tcpser dir to start
tcpser. Now run the x64.exe file in the WinVICE 1.19 dir
and then select File-->Attach disk image-->drive # and
select drive#.d82 from the image12abbs dir to attach all four
images to the SFD-1001 drives.
To load the BBS type:
LOAD"IMAGE 1.2",8,1 and hit ENTER. If you did everything
correctly, you should be looking at a waiting for call screen. Press 1 to
set the day, date, and time (read the docs to learn how to do this).
Congradulations! Your BBS is ready to accept calls. To change the SysOp account
simply logon locally or remotely as SYSOP and then enter ED to edit
your user account information for user #1.