Building an AR for my wife any tips?

I have never built an AR before but after my wife and I shot mine I bought and she said she wanted one of her own. I figured this would be a great opportunity for me to try building one for the first time. She has an Sig Sauer Rose 9mm and I am looking to build this AR with the same color scheme to match that.

Any tips on where to get the parts from and what parts specifically? Looking for good bang for my buck but I want it to be a fairly nice rifle.

I’m looking at the aero precision m4e1 lower I’ll probably do that in black and I would like the switches and trigger to be rose gold. I haven’t really looked into uppers enough to know what I want there yet.. What triggers do yall suggest that come in the color I’m looking for?

I like the style on this hand guard rail, grip, and stock combo but I’m worried they aren’t good quality as I am new to this and don’t know anything about “Off Hand Gear”. Is this something y’all would buy or is there somewhere else I can get something unique in the rose color scheme? Any tips or suggestions on this would be greatly appreciated, thank you!!