Looks like a great product) 4000 Euro is a good price. Remember it's a difference from producing 4 machines to deliver like 20 machines in a year..) Many new producers often underestimates the production time, and promise delivery to the customer after 3 months. Then later say; 6 months. Then later say; 9 months..
When not quite sure about production time, as one possible not are in the start, it's better to tell the customer a long delivery time, like 10 months...Then it will just be a bonus if one can make the delivery after 6 months
Just mentioning this as people in the hobby often seams to be quite disappointed if delivery time of a product is much longer than what they were told at the beginning) Good luck, will be interesting to follow the development.