ALPHA 14 Pre-Release 2 is now available. Along with fixing several from Pre-Release 1 we have now added trading within construction and more populated trade lanes.
This is a pre-release build so all the usual things apply, it will have problems (some of which we know about) and it may break your universe.
If you still wish to give it a try check out all the changes and details here : https://steamcommunity.com/app/416240/discussions/12/2572003428664633947/ and how to access it here: https://steamcommunity.com/app/416240/discussions/12/1729828401713048191/