Chowhound
It would have been easy to fit suitable board room furniture into a standard Hastings cabin, held down using the cargo/seat floor attachments. Although it is difficult to see how it would have been used while the aircraft was parked on the ground due to the fuselage slope. Not a problem in the air but no one could hear then due to the engine noise!
I dont think the four, sound proofed, VIP configered C4 Hastings WD500, WJ324/5/6 had a large table as part of the VIP conversion judging by the interior pictures I have seen.

Richard