Amith's page

I think the intention is for the two mounts to be in the same firing arc.

While the explorer does not have two mounts in the front, there are rules for spending BP to add a mount to a firing arc. I think it's something like 4 BP to add a light weapon mount to an arc, 6 to add a mount to the turret. They also cap how many mounts a ship can have in an arc based on the size of the ship, so I think the micromissle battery would be all you could have in the arc until you get to something like a huge ship.

If I remember correctly, the idea is as your character levels up, they acquire the required permits/contacts to purchase weapons of the correct item level.

So it sounds like there is some control in the Pact worlds, it is just handled in the background so you don't need to worry about.

I think the tier just gives you the number of Build Points you have to use. I don't see anything stopping you from build 2+ ships with those BP.

The spread sheet looks pretty awesome! Great job!

I don't think the drift engine BP cost gets factored into the total remaining BP though.

I am also running into an issue when attempting to change the tier, but it looks like it should work. Maybe it's an issue with the fractions being options? -shrug- I'll poke at it later and see if I can figure it out.

I don't have the CRB yet, but if the wording you posted is correct, it doesn't sound like it reduces the DC. It sounds like it reduces any penalties you have to your skill check. Like if you were attempting to make an acrobatics check but had armor on, you would get to reduce the armor check penality.