Hi,
I still work with discrete components, but if it helps, and you haven't seen them before, try looking at any analog design book, there are hundreds of books and papers freely available online e.g. Analog Design Essentials by W. Sansen and also CMOS_Circuit_Design__Layout__and_Simulation__3rd_Edition are two examples.
I don't know, but a one-stage op amp looks sooo suspect, I can't get one to work and be any practical use, discrete design or CMOS like yours - as stated above, op amps that work are a diff pair, gain stage(s) and output stage afaik.