I ordered a vented trapdoor from Shapeways and cut it up to fit a 40mm fan to cool my 68060. That was a rather bad fit and I contacted its designer Steve and asked him if he could modify it to hold a fan. After a few hours he had made a new version which I ordered. It didn’t quite fit and I carefully measured everything and Steve corrected the model and uploaded it. I ordered it and got it today and it fits perfectly. You need thicker feet to make room for the fan underneath. If you want one too you can order the A1200 cover here on Shapeways. Thanks a bunch Steve!