I placed my order with Headsuprc on Friday afternoon and I received it this morning (Tuesday). Now that is unbelievably fast service!!!
Last night I weighed up the old slimer engine, battery and lead weights and it totals well over 500 grams. The new electric setup weighs 496 grams less the battery os this is going to work out just fine.
When the next pile of eagle poo comes in I will be ordering the batteries and charger along with a decent watt meter. I hope to have the motor properly mounted and battery bay ready to go by then.