Homemade cold frame/mini greenhouse

[Fartlek]

In light of current circumstances I am thinking of turning my chilly patch of decked over garden into something more productive. We have a homemade Wendy house back there and I thought I could convert it to a greenhouse.
Do I just need some perspex panels and some shelves?

Here are some pics. Me and DS built it from scraps but he doesn't play in it anymore. It gets sun from midday to early evening.

Bump? Any suggestions?

I couldn't find a way to cut them to size without leaving dangerously sharp edges or breaking random bits off the edge. Couldn't you have put thick sticky duck tape or similar over the edges?

That's a great idea Mere. It will be much easier to get my hands on some polythene than perspex. I usually nick it from the reuse hub at my workplace which is an art college but that has now been shut.
I was thinking of cutting 2 more holes in the roof and pulling the boards off the sides and replacing these with plastic. It's very windy down the back of our houses but I hope that with the frame in place the plastic will hold.

Sorry, I got my names wrong. Thank you Bob! (but also thank you Mere for replying too)

Polythene coming in the post! Now to find seeds...