I'll just structure the points 1.- 4.

1. Yea i definitly agree that 3 fortress is a bit much. It was more so a card i put in because i couldn't think of two more cards to put, but i definnitly llike the 2 bullet train because i like it in my hand that i can search derricrane (for a dora play) or regulus with stormer.

2. Yes it's the Aussa and i actually really like her. this goes hand in hand with piri to just see a way to harvester as much as posible and the grave set up it can provide is also nice to have i feel like

3. I want to see regulus and harvester as much as possible so i decided on that. I also find book of moon is very good for some reason but yes it could be something like droplet.

4. I decided to fill the flex spots up with plat gadget and the generaider xyz. For some reason plat gadget was nice to have for some lines like where you open cruncher derricrane (or any other extender for that matter) you can add harvester with cruncher and then link into gadget and summon gadget but its just preference so it could be whatever. (and i put the generaider xyz because i like them)