Tank Sunroof Conversion Bit

This is my very first attempt at 3d modeling, so bear with me folks.

I printed out Da5id's tank as my very first print awhile ago, and I love it very much. I love the community here and I really want to try and give back. I was thinking about my tank dudes trying to pick up people in their tank, and then I realized they might be able to pick even MORE people in their tank if they had a sunroof. So BAM! Now you can have your tank.

I would like to get some feedback on how well this bit fits on your tank, so I can try and scale it as needed. It's maybe a smidge too tight, but fits on my tank well enough.

Credit also goes to Da5id again as I used his model of his transport tank to make this model. Thanks Da5id!

Thanks guys, and stay awesome!