I'm not quite sure what you mean by "mounting process". The Schwinn Jaguar, being a cruiser style frame has a large diameter down tube and it has a steep curve to it that requires a special front engine mount. The build you are referring to used square steel tubing but he also added rubber which most of today know is a no-no. The builder also used a shift kit which changes the rear engine mount from the stock version. Check the thread in the 'mounting' section called "oversized tubing solved". There are many fine examples of engine mounts there, any of which can be easily adapted to the Jaguar. I'll edit this post later with a link to that thread for you.
Tom