Gt Battery upgrade kit?

Hi, I've been making batteries for gt boards for quite a while now with Samsung 30q 18650s.
I was wondering if there would be any interest for me to supply a kit to do your own. All the cells spot welded together, all the cable you need, heat shrink. All you would need to do is solder it all following one of the many online tutorials. This would be a cheaper way to get your battery upgraded. I'm guessing the kit would be about £250 delivered and maybe take most people a couple of hours to put together. What's everyone's thoughts on this idea? Thanks jamie. UK only.