The reason I asked about the memory is because I have a simlar setup to you and I'm also new to the scene like yourself
Let's talk about the A604 first of all. With just the A604 in place with the ECS in place I have 1,440,070 or there about meaning that I have 2Meg of chip mem. The other mem is showing 0 After messing with the setting in WinUAE I think this is correct. (anybody else please feel free to correct me otherwise) As for the chip missing so is mine however if you look on the two different pictures you have the other chip is missing in the upper left and is in place in the other picture.
As for the delock. I found that when plugging it into the A600 I was able to put it into two different position into the motherboard. Apparently this is common. As for my own configuration I'm getting a lot of 1111 Error which from all accounts seems to be a hardware issue. Anyway I hope this helps somewhat.