recommendation for machine

Hello,

I am new to this group and not a machinist but an accountant who is a
partner in a small venture to manufacture a limited production of
rather expensive tube amplifiers. After pricing out having chassis
built by a CNC shop we have decided to investigate acquiring our own
equipment to get the job done.

Our basic requirements are that we need to perform very accurate and
clean drilling/punching/milling operations on a maximum sized 18" x
14" sheet metal (copper, aluminum, stainless steel) with a max
thickness of 0.090".

The maximum hole sizes we need to cleanly cut/drill/punch are 2.75".

We would like to know if such a machine exists that can be had for not
a small fortune that require a hangar for room!

I"ve attached an Autocad file with samples of the drawings of the
chassis if anyone is interested. All help is appreciated.

Regards,

Carl