I use poster paper same as your card stock I would guess I put the ruler on it use a knife against the edge of the ruler cut about half way through fold it divide by half the with of what I'm making cut that off then draw the curve cut that off lay it on the paper draw the outline and done maybe 1 min and it's perfect . For the cutting I use a head knife and depending on how sharp a turn I may use a pattern head knife they make the cutting very fast and accurate .
My son is a cad computer guy he also uses a computer for curves buy the time he makes the curve adjustments and all that crap I have already cut the leather LOL
the way to make a curve keep your wrist on the table forget the French curve stuff keep the wrist and forearm on the table using only your wrist to make the line this is the best way to make a curve practice it and you'll see .
Nice and best of luck with that it really looks professional I could see that logo and name becoming known world wide it just looks like that to me good luck .
Glad I could be of help like to see it when it's done and yes a bit of wet forming will do it you should have enough room for a 1.5" belt good luck with it Frodo.
When I saw the title it made me think of operation vegetarian , An Infamous World War two operation, that thank God Didn't happen.
RJF has some great leather.