Coming along nicely! You're going to have a little treasure there. Get a nice plastic box display, and when mounted, have two little holes drilled in the base, have them fill it with Argon Gas. Those holes have to be such that they are, when filled, can be plugged with glue, rubber, etc. It is not filled under pressure, it just displaces the air, and Argon is so neutral, it will prevent deterioration. The Argon is heavier than air, so you want to have the model firmly mounted, and put the fill and drain hole on the bottom, so when righted, any "air" will remain above the model.