One could use a 6 inch OD or so pipe and use a castable refractory such as Kast-O-Lite 26 LI for temps in the range of 2600 F or Versaflow 60 Plus for 3100 F. For the holes, depending on the cure temperature of the refractory a candle could be used and then melted out.
Looks like an interesting project that would be suitable for use with soft glass.
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