Nice job as always Russel. The only concern I have is the use of tung oil product in conjunction with wine storage. The off gassing of the tung oil in a climate controlled sealed room has the long term potential to contaminate the wine stored in bottles with corks.
I know you said previously that the tung oil was customer specified, so I hope they did their research. This is more a heads up to you. The situation is the same when using western red cedar in a wine cellar.
John