Your in luck! A 3d printed mod is my go to. Mine are 18650 but gdeal just made a 26650 Peko! Check out the 3d printed mechanical thread.
You just have to assemble yourself but there is a build doc for that.
Order the 3d print from sculpteo. I'll get you a link to Gdeals sculpteo shop in a second.
Also the parts kits are available at
www.livewiremods.com
Use that link above and more information on Sculpteo is on there too. Pretty sure that site has a link to the build doc. If not Pm "GDeal" with questions. He's the creater and would be glad to help. I currently I have 3 Pekos. All 18650 of course but that's my personal choice.
-Mark