Hi
I'm soo soo sorry for you and your little tortie.
I don't know very much but can tell from what you said that you did above and beyond for the little fella and that in his time with you he felt cared and loved in a tortie way.. You did you very best.. And his enclosure is beautiful and...
Poor little Mr.. Feel so sorry for him.... I would secretly call animal wardens/officers so they come in, and enforce proper care, diet and housing for the lovely tortie.... ???They don't need to know its you, they need to be told its not a choice but enforcement by the law...