Yeah... there's an elegant simplicity to Atmizoo mods. I use a dingo in 18490 and a roller in 18650 and one day will buy a lab.
The only other telescope I have is a sentinel m16 clone which is horrible. With the roller, no threads are visible in 18650 mode, you have no real
sense of holding a multi section mod, and it has a battery cap at the bottom so you don't have to untelescope it to insert a battery. And I'm surprised at how short it is.
And I agree - an 18650 tube for the dingo would be nice.
There's no mention on the site of what happens if you use 2 tubes on a dingo. I imagine it don't get you 18650 functionality, but it looks to me to be pretty close. You could mail them and ask...