Hello,
I am new to freelance jobs, but I do have extensive experience working with linux systems.
Before starting this project, I would like some clarifications: what do you mean by app store? Are you referring to the default package manager in TinyCore?
"OS file should be read-only" : Are you referring to the kernel files in TinyCore or the complete OS image?
I should get a working image according to your modifications in 3 days or less. We'll discuss final adjustments and modifications after that.
Regards,
Karl