If there is anyone who is willing and able to code an export function for an mdl, please contact me to discuss the conditions and timeframe for that.
Me, myself, I am very interested in learning how to do it, but I have no time for this for now.
I don't mind to pay for a solution, even if it shall be open to everyone in the community.
I prefer a solution that is as lucid as ventilator's obj-exporter, because I could learn from it.