Hi YSPhotog.
Thanks for the update!
Quite right! 
DIY mattresses can be challenging and rewarding, but they definitely require much more research and, often, larger time investments and “tinkering.” You can spend months or even years looking for the perfect layer combination. We recently had someone share their 5 years DIY mattress journey, which you may find interesting to read when you have time.
If a DIY is something you wish to continue exploring here in the forum, we’re always here to answer questions!
And, of course, any time you have mattress related questions of any kind we’re ready and waiting.
Phoenix