I used a regular domestic machine inherited from my grandmother. All metal Pfaff.
For a dacron jib to go on a Farrier 31, I would have spent the money for one of the sailrite machines with zig-zag and walking foot. I would have done a Blade jib first to get the experience and minimize the risk.

The way to work on large sails in a confined area is to build it in parts. Then roll/fold and assemble the sub-assemblies. We had like 3x4m of floor for our Tornado sailmaking and mains and spis were possible there.