Nice pics. It is fun to see other folks' rigs.
Can you elaborate on how you added the blower to the heat sink? Or did you remove the factory heat sink and then reattach the whole assembly including the blower?You can also see the modifications I made to my Turbo040 when overclocking it to 48MHz. The crystal oscillator has been socketed and the 20MHz unit replaced with a 24MHz one. I added a blower to the factory heatsink, which gets rid of the crashing problem. I affixed the heatsink to the 68040 using the old overclocker's 'super glue and arctic silver' method, removing the frag tape DayStar had used. I also put some little heatsinks on the ASIC and cache SRAM just for fun; they probably don't help much but they can't hurt, right?
Nice overclocking job. Any time I get a Turbo040, after I test it, the first thing I do is add an oscillator socket. They are just too overclockable not to. Especially if you get something like a 25 MHz model.