Yes, it is possible. But if the mod runs as it is, why convert it? Download an empty mod and start from there. Look at other csm mods to see how they are structured, use the information to build your mod.
There might already be a 1993 csm mod available. If your next question is going to be where do I find it, I do not know. Google is your friend, also try GP4-Argentina.com
[
www.mediafire.com] Some say you should click it, you know you want to.
[
www.gp4central.com] <----GP4 Central