Cheap surron build

does anyone know how cheap i could do a peice by peice surron lbx build? i cant afford a 3k used one so i was thinking abt building peice by peice with used/cheap parts (it doesent need to be as good as a stock lbx eg could have 48v battery etc but i want it on an lbx frame. if anyone has any good recmondartions pls lmk thx