let me explain, any old stove from pre-1980 was also UL listed. today stoves have to be EPA certified, or they are illegal to sell. making and selling a noncompliant stove from the EPA standpoint, carries serious fines and can even lead to a prison sentence for the guy tooling it up with impunity for the laws. the website is there but lists no prices or pictures. sorry but I'd have to disagree with your statement without verfication from the stove maker, I don't think they are being made, because the only stoves that would pass today's strict emission laws, would be catalytic, noncatalytic secondary air reburn type, or anthracite coal stoves.
the only way to make a wood stove today that can burn dirty, is get it classified as a furnace, and the old tempwood is too small to get that exemption.
if these stoves are being made across the cape, they are taking a big risk of getting nailed for some serious EPA violations. I have relatives on the cape and have been there many times, being the type of eco-conscious area it is, I find this doubtful. yes they may be efficient, but they have to pass a grams per hour emission test to be legal to sell to the public now. don't take this the wrong way, I'm not a tree hugger by a long shot, if it was up to me there would be no emissions standards on anything. but this is the law today.
if it was so easy to make a clean burning stove by just drafting it with 2 tubes downward, they would not bother installing $350 cats and fragile ceramic reburn chambers in non-cats. They'd just put 2 cheap iron downdraft pipes on it and be done. I have 99.9% certainty that the old tempwood stove design would never pass today's stringent EPA laws, they just made them even more strict only a week ago. The OP of this thread has not posted again since this thread, I have strong intuition this project has been deep sixed.