I've put this here instead of my thread since I consider it "(a) simple change(s)". Gave the scratch built Jack a minor refurbishment, namely: a better bucket, proper mudguards, a more consistent no. 11 and some missing/faded spots of red. The previous bucket was too long and flat, rough on the inside and had one tooth less than it should have. I considered replacing it with a repainted green (farm) one in a similar size, but this proved more efficient. The old mudguards now act as supports for the improved ones.
Also thought about measuring the Whistle & Go Thomas to make a "Pack Scale" copy with a more useful chassis and scratchbuilding trucks, track and a Percy to go with him. I'd rather scale down the Pack to match TOMY or Take Along, however.