Would be nice to see one - at least for what they have now - but they still will have more to add to a completed one.
If you mean a chart showing what you can build based on what you have: There will be two tech tiers, and I remember reading that the smaller versions will let you/be required for you to build the next tier (but don't take this part as truth). If you mean an SC2-style building tree: There won't be one, except for what I said above.
I put together a pretty basic diagram. The general idea is a somewhat linear progression: 1. The commander can create all of the basic factories and resource collectors, and most of the base defenses. 2. The basic factory creates basic attack, scout & fabrication units. 3. The fabrication units can create all basic structures, as well as advanced factories of its own type. 4. The advanced factory can create advanced attack and fabrication units. 5. The advanced fabrication units can create all advanced structures except for advanced factories outside their type.
I categorized it under base defenses since the diagram was getting messy as it was. Though if I were to redo it I'd make that distinction.
needs some work, i think. not just the fact that it's in paint, but it's rather difficult to follow. ill see if i can whip something up tomorrow. regardless, thank you for your efforts!
Looks good, though you'll want to get rid of the shadow at the top. Also Commander needs to be in there, he's the top of the food chain after all.