I bought this kit a couple of weeks back.
Now when you buy a Guillows kit you don't expect competition grade balsa however the stuff in this kit was off the charts at around 17-18 lbs more than twice the density of what you need to use for rubber power. Rubber power simply would not get that sort of weight off the ground just two sheets weigh 30g.
I contacted Guillows customer Service for replacement wood over 2 weeks ago, dissapointingly I've heard nothing at all in that time....