I'm interested - I love 3D printers :)

400x400x400mm is a pretty awesome build area and is the kind of size I would go for if (when?) I build myself a new printer one day.

What are you using for print bed? I've been having a great experience lately with printbite+ on a tooling plate.

Just FYI, you can get silicon heater mats made up to order so whatever size/voltage/wattage you want. The ones I ordered for my new build plates have a thermistor built in and came with tape applied ready to fit so very convenient.