Here is a partial list - enclosure, terminal strips and step down transformer 240 pri to 24 volt secondary
Q302013PCI : J Box Type 4X / Screw Cover ...
sure its possible. what you'll be purchasing as an extra is a control relay with a 24 volt ac coil and a 120 volt rated open contact also a 120 volt...
not to confuse you more but you can reduce the number of cables going to your two gang box by using a three wire. colored, red, black and white plus...