10 engines supported by 5-10 reactors, and the rest of the space taken up by cargo holds, and this ship will work wonders in the near future. Tell Researcher 3 to work on whatever you want to Research. Actually, it would be a good idea to keep it working on Energy continously from now on, at least until a new GCF can take the job. Tell the Constructor to build 4 of these new Miners. Again, tell the Researchers to research whatever you want to research.
Hull tech is a very good idea.
As I suggested above, you should've used the Empire at a Glance window to order your 4 New Miners to go mine Baslinite, Nergium, and Dolinium. Now tell your Constructor to build 4 of the New Transports. Memorize where those resource rich planets are, close all windows but the Big One, and then click on the Connect the Dot puzzle in the Tool bar up top. This opens the Route window. Click on 'New' and type in a name such as Baslinite Run.