i have been struggling these days with sticky problems on a new vat, and found this guy in France who make is own top-down printer
So i can see that the Draken would quite easily adapt itself to be transformed in a top-down 3Dprinter, withe the following things to do:
Move the projector upward and rotate it 180 degrees with it support (and some adaptation)
move the screw downward
suppress the plate arm
make a new printing plate arm and printing plate (with perforations)
suppress the VAT
i have been testing my B9 yellow resin mixed with salt water and my resin stays upward (which can be useful not to pour 1 liter resins in the printing compartment).
I suppose i miss some trouble so ask for your help if someone as made any test and has any exprerience with this kind of prints.