Greg did say he's using a through-hole component design...a wise first step. The components in his version would be about 50 cents per board in small quantities on eBay. So even if the extra square inch increases board cost, in DIY quantities it might be a wash if eBay from Asia is an option. Then there's the assembly and handling hassles of surface-mount parts which require the dexterity and eyesight of a teenager. 
