Conditional Form: Change Image on Click

I am trying to make a multistep form. This form is for people to build a model of a pre-packaged house. They start with a welcome, then choose their roof style, their kitchen cabinet finishes, flooring, and upgrades. I want to have it so that when they choose “Lean-to roof” it changes my image to the Lean-to roof model. if they select “Peaked roof” it shows them this image. Then they go to the next page, and its the same thing for the cabinets. Choose “white” kitchen cabinets from the radio button, the image on the form changes to the White Cabinet Image. if they choose dark, it changes the image to dark. you get the jist.
I have built the entire form, and love this method because their model can easily be saved for us to price. I initially wanted the form to remember all selections, and then display a summary at the end (But I am not good enough on here to accomplish this).
Please let me know if there is anything that you guys can suggest for making this as easy as possible on myself, because I feel like I am making this harder than it is!