next project? help and questions

ive successfully completed a harlot and recently my dd17.2!

I'm looking for a new project to look intio... rather that be another version of what ive already done, or something new. im interested in an AR pla+ lower and purchase remaining parts. if i do decide to buy something new what do you guys recommend? id love to make a semi that looks like a ported tec-9... however idk what platform to start frame wise and were to source those parts