Combining a Rank system, Morph GUI, and team select?

Alright, so I have a GUI morph with a team select, it is basic for now... you choose your team, then you have the option to choose between 3 morphs, each specific to the team you chose. How do I lock some of the morphs from low ranking people.

EX: Team Chosen: GREEN

Green Soldier= Rank required(1)
Green Elite= Rank required(5)
Green General= Rank required(100)

Keep in mind, each morph has its own set of clothing, guns and stats. I do not want to share any of my coding from for the GUI morph itself, and I also understand this severely prohibits any kind of major help from anyone here. So, all I need is a Rank Lock type of thing. Something to keep certain morphs locked until a certain required level is met.

Thank you for considering my request :3

if rank > 0 then
	-- then you would have the morph script here, with all of the events and everything
end