That sounds like quite a feat but I was worried that you had no previous experience in AAA level games which is where this is headed. Altough it seems you don’t and are Indie you can still afford the team for proof of concept which many people can’t. The idea sounds fun and nostalgic for roleplayers such as myself if pulled of to where its balanced and fair for all classes of players. I don’t really think making a trailer as a start is a good idea and development should be centered on stable gameplay, most trailers do high poly versions for trailers and don’t show the viewer the real quality. I hope to see that this goes somewhere and its sounds interesting, good luck.