Rob,
I've been sailing since the late 70's and never bought a tramp, (in fact making your own sails can be a lot of fun too).
Before you go out and buy an industrial sewing machine for your tramp, give your domestic machine a go.
I've made tramps with domestic machines before I got my industrial machine.
Provided you are using chickopee mesh, the weave is much easier to get through than sailcloth , (because it is a fairly open weave and it is not impregnated with resin like sailcloth).

Someone else mentioned they had problems repairing a tramp wih a domestic machine. Repair work is usually much harder, partly because the fabric has aged and partly because it can be impregnated with salt.

Now if you are thinking of doing more work like making or repairing your own sails buy the industrial machine.

Just my 2 cents.
Regards,
Phill

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!