Mr Motley II approves of the build. Bold color choices on the grips, pedals, and cables, but as with the aforementioned tire graphics, everything ties in with the decal package. And I see that you are starting to learn the ins and outs of N+1. The correct answer to your dilemma is to buy another bike and not sell anything. Ever.
Yes. If you go back to the first post, you'll see it has a BMX sized BB shell as it would have originally come with a one-piece crank. The adaptor is shown in the 4th pic allowing @Nexman88 to fit a superior BB and gives him more options on cranks/chainset.
Hiya , it has an oversized BB size that did not fit the general BB size it was a truvativ adaptor which I had to get put on a lathe to reduce and make it fit as the frames rolled steel at the bottom there is a lip I did not want to grind down as such
I was looking at the first post but couldn't deduce the exact BB size from that photo. It's unusual for a MTB like that to have a US BB shell. I have experience with BMX BB adaptors, never had to machine one down though. It looks like the adaptor was pretty deep for some reason, the DMR Wondercups I've used are shallower.
100% this!!! 
The first rule of RetroBike club is...
