I'm going to have to start playing with some ideas myself as I have plenty of printers now and growing weekly so its time to pull my finger out.
So far there's 2x R3000, 3800, p600, p800, 3x L1800, 4x L805.
I have ideas for similar to yours but keeping it as small as possible.
Presumably some things would need lengthening depending on the printer as the L1800 is popular but very slow so a short run between the printer, powder and curing would be possible but for faster printers a longer run would be required so it has a larger heating area to make sure its done before leaving the heating area.
Do you know if it makes any difference if cured from above or below?