Manipulating the Contract System- seeking advice

[Waxing_Kibbous]

As per this thread http://forum.kerbalspaceprogram.com/index.php?/topic/130796-admin-building-to-control-contract-types/#comment-2381009

I'd like some guidance on what it would take to make this. What I would need:

A Gui with sliders

A way to change inputs of the sliders based on a building level

A way to manipulate contract type spawning percentages

In the Contracts.cfg I see entries like this:

 Recovery // Rescue and Recovery Contracts

that appear to be the categories I can manipulate. Preferably I'd be able to make this happen with addons like MM but I doubt this will happen- any advice, or pointing to some examples that use similar code would be great. I am not the greatest coder on the planet but I'd like to see this as an addon- if it doesn't require too much brain power I'll give it a shot