Thanks to all the comments/suggestions. I have to admit that I tried the beans today .....I didnt think 3 days was that long to wait before I started! Anyway my wife is very impressed. Had to set the grinder a little coarser as the shot was going a little slow - however the shot was very syrupy and good crema. Taste was very well rounded, a little earthy, very tasty.
I will now wait a couple more days :

When I used the air compressor blower during the roasting - I really only used that to blow the chaff away.....by the time SC came hardly any chaff was coming out (all over my garage bench/floor).
The bean cooler I made uses one of those home kitchen/bathroom extraction fans. I just pushed it into the 20L bucket (it fits perfectly) so that it blew upwards. I wired it up to a power cord but didnt bother about a switch. The sieve I bought sits on top but just rest there....I plan to modify it so it locks on somehow (just in case you knock it and loose all your precious beans/effort/love). I drilled 8 holes at the bottom of the bucket with my largest hole saw (I think 55mm) The fan blows the beans and I noticed that the pressure was enough to lift the outer beans slightly. Beans were cool in about a minute.
Thanks again for everyones comments/suggestions. Look forward to sharing more good experiences!
Cheers,
Alistair

-- I tried my leaf-blower once -- not a good plan :-/
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