I think elegans would be grown the same as other Grammatophyllums; bright light (even direct sun when established), open airy media and copious watering and fertilizer. Gramms are similar to Catasetums, they form root baskets that trap litter, but do not require such a long dry rest. Seedling Gramms usually establish quite fast. They need to dry in between waterings as the roots need a lot of fresh air. They are ok with repotting when young but mature plants very much hate to be divided.