Help needed! - Sea Lion Lined Pool!

[J-Double U]

Heyy everyone,

I am currently in the process of re-creating an area of my local wildlife park that houses Californian sea lions but I have run into an issue where the lined pool is concerned. Following BongoHardwood's lined pool tutorial on YouTube, the straight and inside curved edges were pretty much a doddle however, even following his methods for outside curved edges, I just can't get the pieces to merge seamlessly (as you will see from the below images). Any suggestions, help or solutions would be greatly appreciated!

Thanks,

J-Double U

Edit: Thanks to HeatherG for the photo help!

 

[HeatherG]

EDIT: Not currently letting me upload/attach photos, I am trying to rectify this!

The photos would need to be under 1 million bytes. That's the first thing I would check.