Hollow attachable shield as engine cover (with open position)?

[Zah]

Hi, I'm currently working on a Kerbin return ship for interplanetary motherships that's also going to double as an emergency escape ship for stations. For that I want shielding on everything.

I've already embedded the engine in hollow tanks and am now looking for shield/cover for the nozzle, similar to what the Soyuz uses.
However, I'd prefer a mechanism similar to the stock shielded docking port or a leaf shutter.

I know I could use Infernal Robotics, but I'd prefer a one-part solution(part count adds up) that doesn't affect the balance of my ship and opens without having to fiddle in menus.

I've been looking for a mod all day, does anyone know something? It doesn't even have to be the right size, I can add Tweakscale myself. It just must be hollow so it doesn't blow up when I fire the engine.

Sort-of demonstration of what I'm working on:

Edited October 15, 2018 by Zah

[Barar]

This mod has a heat shield that opens on the bottom, if need you can rescale it.