I may have to get me a Skyline after reading this thread....................
Does it have more airflow than the K5? That's the only thing I would change on that tank.
@moff000 if you like the skyline i'd also recommend the sxk doggystyled. It's a great tank, tiny profile, super simple and works flawlessly for me. I actually find the flavour superior to all the other tanks I use and I've never had a leak, flooding or a dry hot apart from once when I didn't realise I'd puffed it dry! You can pick it up really cheap as well.