Made this awhile ago in beta, so now since alpha is up I will post it to hopefully get some comments, unlike last time. Note this was quite awhile ago, when I pretty much first started powder toy. Hopefully I can encrypt this properly :\
I am in the process of making a 8 maybe 16 bit addition (maybe also subtraction) calculator. I am just working out the binary/bcd/7 segement encoders/decoders.
Cool. If you want to make another clock I'd say make different speeds. other than that maybe try to get rid of the lag time by coating the whole lighter upper thing with NSCN on the inside and INST on the outside with something connecting to the INST to make it light up obviously