I think because most people here only have a limited amount of time to spend on this, by all means, if they feel they can make a contribution now, I think they should just do it when they have that time, even if it may only become relevant or useful later on. We just need to try to keep serious track of what has already been done, and what really needs doing.
Personally, I'm currently working full-time, just became uncle/god-father, have limited time before I go back to Ghana, and need to get so many things unrelated to 0 A.D. done, which really drain the amount of time I can spend on this [awesome] project. So anytime someone offers their help, opinion or contribution to this mod, however big or small, I get really excited Thank you @fabio and @Lion.Kanzen for your participation
When I find some time, I will be providing a complete preliminary unit roster, as well as necessary lists of building and unit props.
On a side note, the homepage for Microsoft's Bing search engine features a beautiful new image everyday. On 25 / 05 / 2017, this image was a photograph of the Begrawiya Royal Necropolis at Meroe. A beautiful illustration of this history, slowly becoming part of the mainstream historical canon.