Tips for modifying my Squier Strat?

You would need a boat load of money to change all of what you want to change , you might find a reasonable guitar that you can use for parts or rebuild a better guitar that does not need a neck and all of what you want , and I would try a mixture of pickups 2 of one and one for your lows I like a Larwence Blades for my lows and Emgs for my high , but that is me . Good luck .