I too built Guillows kits years back- their WWI series,Camel, Spad were nice as was the Cessna 170 etc. I too found them all to be heavy due largely as a result of the hard balsa supplied with thier kits;however with a little extra work made terrific display models with accuracy of out line nice indeed. I recollect building the Super Cub for a Cox 020 but don't remember flying it; I found all the Guillows kits too heavy for rubber power: but my knowledge was limited then as to using a rubber winder to pack in the turns and all that. I remember the 'DC Maxie Cutters' were pros in this category ( I wonder-where do we get Guillows kits from?)