>They haven't decided if I will get to drill lots of holes in the
>chamber floor but that would make life much easier for me.

Just what is the temperature range? To me that is the biggest hurdle to 
putting suitable loadcells inside the chamber, as sealing against moisture 
is relatively easy (many suitable loadcells will be sealed anyway for 
outside use)

Then you may be able to use the existing holes to put connectors to the 
loadcells inside the chamber. 

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