Nascom 2 cooling fan(s)??

Calling on the wisdom of list members here... How warm does a) the PSU and b) the logic circuitry get in a Nascom 2? I'm currently in the process of dismantling the enormous wooden box which my acquired Nascom 2 came in and replacing it with a smaller old wooden box with a hinged lid. Boards (I have CPU board + memory) will be mounted vertically, likely at one end of the new box. Transformer + PSU will be at the opposite end. The machine as I got it had no fan in it, but then the horrible plywood crate was almost big enough to live inside :-) It just had some ventilation holes in the corner where the transformer was. I'm not sure whether I could really do with a fan blowing air over the PSU, or even two, with one on the PSU and one on the card stack. Or maybe passive cooling of PSU + cards is sufficient... Thoughts welcome. If I'm going to go the fan route I should really find period fans I suppose! Incidentally the new box is about 14" wide x 10" deep x 14" high, with a hinged lid, and large iron hinged handles at either end. All tounge and groove wooden construction, using particularly soft wood of unknown origin. In particularly ornate black script it reads "3" on the front and "51 to 79" and "15 x 12" on one side. I have no idea what it was used for, but put the age at probably around 1950 (possibly earlier). It may well be military, Post Office, or railways I imagine. Anyone? I'll reproduce the black lettering on the finished machine I think even though I have no idea what it means :-) The metal hinges and other fittings have been in a electrolysis bath for the last day and are looking particilarly nice. I'll keep the ports all round the back of the box, then if I can somehow build a slimline case for the keyboard then there'll be *just* enough room to stow the keyboard inside the box at the top and close the lid :) cheers Jules