Technics SP 10 mc II. Worth looking at?

If a TT arrives with a Plinth, I would not concern oneself too much about the methods and materials used to produce the structural device.
Much better time will be spent learning how to mount the TT on a support device.
A cheap option will be to go for a Wall Mounted TT Shelve, and then use a Sub Plinth and decide on a few different footer types to isolate the Wall shelf and Sub Plinth and the Sub Plinth and TT Plinth.
Once you are rewarded with the values on offer for the mounting of the TT, any changes made for a Plinth down the line will be benefitted by the mounting system produced, 'well as long as',  it can take the weight of a new plinth design.      

The only "irreplaceable" part is the single IC, MN6042.  JP Jones has developed a replacement part for the MN6042, built from discrete SMD components.  So there is nothing to fear in terms of parts.  His business is called "Fidelis Analog", and you can find it on-line.  If you are buying an aged device, andt you want it to work precisely up to its original specification, it just makes sense to replace all the electrolytic capacitors, unless you can verify that it was recently done by a previous owner.  The OEM capacitors would now be at least 40 years old.  However, there is no need to be concerned about film capacitors; they last "forever" unless their voltage rating has been exceeded in circuit.  In connection with replacing the electrolytics, you can think about having it calibrated as well.  These precautionary service steps should not be expensive.  In the US, one can buy all the needed capacitors for under $20.  If you needed to replace the MN6042 IC, that would cost more; consult JP.  If the tt runs up to speed and is speed stable, chances are you do not need a new IC.

People always overestimate everything on audiogon, it's ridiculous.
As stated earlier in this thread the SP-10 mkII is a broadcast machine, you will not find any "special" sub plinth or "wall mount shelfs" at those broadcast studios. This is a typical broadcast application of an SP-10 mkII. Here is a bit more complicated stuff. And this is a simple home use plinth for earlier version. The original obsidian plinth is here. 

Why people overestimate everything when it comes to plinth? 
Technics in custom made plinth can be placed DIRECTLY on a table or your furniture if they are stable. I made a custom metal table (rack) and put my gear on top, there are small sarbothane pads under the triplex glass and metal table filled with sand. Here is my gear when I owned SP-10 mkII.

Technics SP-10 mkII can be used even nude without plinth if you will put AT-616 pneumatic insulators under the drive. In this case you need a base for tonearm, here is review fo Toho cast iron base. 

Look at this catalog for Toho plinth and base for Technics SP-10 mkII, I doubt you will find it, but it's for inspiration. 

The best way is to make plywood plinth if the one you're buying is not good enough. Will cost you probably $300 (you need a carpenter). 

This new plinth from a high-end plinth manufacturer will cost you probably $10k :))  

The only "irreplaceable" part is the single IC, MN6042. JP Jones has developed a replacement part for the MN6042, built from discrete SMD components. So there is nothing to fear in terms of parts. His business is called "Fidelis Analog", and you can find it on-line.

His chip is for MK 3 ONLY @lewm
I already gave a link to his site earlier in this thread

Most auctions see all the bidding action in the last 2minutes. This whole convo will change in terms of value during that 2 minutes and it will be to late to ask anything then. 
Given your location, shipping for any restoration work is a real cost consideration. As much as I loved my SP10mkII, I'd say this auction purchase has a good amount of risk.
If you really are determined to make a go of it, consider setting up an esnipe account, figure out your max bid ahead of time and let the algorithm do it's thing in the last minute of the auction. Cheers,
Spencer