I'm going to elaborate on the person above me, and it's going to sound a little bitchy but I don't mean it that way, my intentions are good.
I'm a very hands on person, I'm a Ford senior master tech, specialized in automatic transmissions. I build things. I am in a sense a "maker" but I hate that terminology. I now teach automotive mechanics. I've listened to all the podcasts on rocket mass heaters and love the idea. I want one. It's going to happen. The problem is that currently in my life, I do not have time to tinker with design after design to make it work best. Honestly the idea of tinkering doesn't interest me. What I am looking for and I think everyone else is looking for also, is written step by step instructions, with well illustrated pictures of every step of construction of what I will call the "burn module" which I would characterize as feedtube, burn chamber, riser, barrel and manifold. All of the flue piping through a bench or building a mass is the easy part. I know your focusing on workshops and "showing" people how to build these things, but a lot of us are not tactile learners and require written word.
Before the next paragraph is read , please take it as constructive criticism. In one of your dailyish emails the plans for the 6 inch annex were given away. The plans were poor. I don't know if later plans have gotten better, but really what we need is annotated pictures and not drawings.
If a shippable core was designed with very explicit detailed WRITTEN instructions, it would be a home run. I have the ianto book, but again very poor. There's too many options. I don't want options, give me a solid burn module design of an 8 inch or 6 inch a parts list and i'd buy it tomorrow. Material cost for the burn module under 1000 dollars maybe 500 for the flue pipe and your very competitive to any pellet stove out there. I don't like how the ianto book throws around ideas to save money. I want to do it right one time, build the best design with the best components.
If you would like any help creating such a thing let me know, it's not fair to throw in some stuff that's sounds a little bitchy without offering to pitch in and create a solution. I almost say to hell with a shippable core and make a shippable burn module.
I'm borderline on the fence about buying the DVD set because I just don't learn that way. Perhaps if there was a very long WRITTEN list of exactly what was in them I could pull the trigger.
Same thing with this new shippable core, if you want to sell them, give us in writing what exactly is included and give us real annotated pictures and not cad drawings. If it's not available outside the appropriate technology course maybe that information could be a little more transparent as well