Hi Daz,

Welcome. I'm just up road from you about 10 miles away in hemsworth.

Don't let those covers and Fancy Swiss gimicks fool you. Peel away those covers and the basic machine is just the same has we build.
The custom cutting heads and Bespoke software are what your paying for with a Zund but with a little imagination then anything they do we can do.

Tangential Drag knife is easy to do and probably better option for you than a plain drag knife. Vac bed is a little harder or should say potentialy more expensive thing to do depending on the materials and shapes/sizes etc.

The basic machine is easy enough to design/build but at this size it needs to be done right has the bigger they are the harder to get accurate and the more critical the selection of components to build it with.
So with this said let me warn you New builders who start with such a large first build often fail or are disapointed with the end results. Often leading to a MK2 version after wasting money learning on Mk1.!! . . . So my point being don't go rushing into building one without plenty of research and learning.

I'll glady help steer you away from trouble on this and I'll PM you my number if you fancy a chat.

Good luck.!