I presume most of our readers are aware that you can't actually power a rocket with only magnesium and aluminum. Then again, I suppose our author and editors don't want to tell terrorists what they already know. Come on, guys, information on rocket fuels has been available to the general public since the 1950s ("Rocket Manual for Amateurs", published in connection with a rocket club at Fort Sill, Oklahoma, had plans for rockets ranging from a CO2 bulb inside a cigar tube to one similar in size to Leon's Tasman Sea distaster-in-the-making, powered by a pretty hazardous, inefficient, but very, very fast-burning propellant mix; it came out in, as I recall, 1957). FWIW, an early 21st century amateur rocket the size of Leon's, built with the common "80% motor" proportion, is probably capable of busting 6 km altitude and Mach 2 -- and impacting at close to Mach 1 when it finally comes down, if the recovery system fails.