Sam, you asked, so here is some brotherly suggestions that you can refer to years down the road:
If I knew prior to acquiring one what I learned after owning a ferret, I would have been more cautious of becoming an owner. I was fortunate that the seller was known, gave full disclosure, and a exceptionally reasonable buy in price.
I would not consider a ferret without a complete independent appraisal and long distance road test by a specialist. Buyer beware. Take your time and explore all your options before you jump in. With the right acquisition, you will have a great time!
A ferret running on a external fuel supply suggests the need to re/re the fuel tank as well as the pump. That will be thousands of dollars. To suggest you are going to modify or replace a turret may not be good advice. I challenge the suggestion this would be a simple task. Price the correct tires here in Canada to prevent sticker shock. Brakes? Huh? You have not even scratched the surface.
There is much to be said for going with a jeep. Even so, a quality jeep appraisal will save you thousands.