Burgmaster CNC

Hi

I'm considering buying an old CNC machine, but I haven't been able to find any information about it online, so I'm not sure if it's a good investment.
The machine is based on a Burgmaster with a Föhrenbach DCNC 82V4H plate (built in 1987).

Originally it was equipped with DC servo motors, but after the original controllers failed, the previous owner retrofitted it with NEMA 34 stepper motors, inexpensive digital stepper drivers, and Mach3 running on an old PC through a parallel port.
Mechanically, the machine appears to be in very good condition.
Specifications so far:

Approximate travels: 700 × 500 × 200 mm (X/Y/Z)
Weight: 800 kg
Cast iron construction
Precision dovetail (prismatic) guideways
Fine-pitch lead screws on X and Y
Ball screw on Z
2 kW belt-driven spindle motor with manual pulley speed selection
6-station mechanical indexing turret tool changer
Threaded collet holders on each station (one currently has a 16 mm end mill installed)

I removed the way covers to inspect the machine. The guideways, lead screws, and table all appear to be in excellent condition. There is virtually no visible wear, and the machine seems to have seen relatively little use. Most of the cosmetic damage is simply from having other equipment and materials stacked against it over the years.

My only concern is the spindle. There is a slight amount of radial play that can be felt by hand with a tool installed, although I haven't measured it with a dial indicator yet. I plan to do that on my next visit.

The mechanical turret and spindle arrangement make me think it was originally designed primarily for drilling and tapping, rather than as a conventional milling machine. However, I mainly plan to machine aluminum and plastics (Delrin, nylon, PTFE), not heavy steel.

The alternative would be buying a manual milling machine and performing a complete CNC conversion myself, but by the time I add motors, drives, ball screws, and a controller, the total cost would be very similar to this machine.

If the spindle eventually turns out to be the weak point, I would even consider replacing it with a modern spindle in the future, while keeping the existing cast iron structure.

My questions are:
1. Has anyone seen or worked on a Föhrenbach DCNC machine like this?
2. Does this sound like a drilling/tapping center with limited milling capability, or a light milling machine?
3. Would you consider this a good candidate for a LinuxCNC retrofit?
4. Is the combination of dovetail guideways, lead screws on X/Y, and a ball screw on Z a significant limitation for aluminum machining?
5. Assuming the spindle bearings are still in reasonable condition, would you consider this machine worth buying for around USD 4,500? (kind of a good price in Bolivia)

Any advice or experience would be greatly appreciated.

Thanks!