<human>: When I was about 10 years old I went into a small toy store with my Mum and we ended up having a friendly chat with the owner of the store. This was a pretty small shop on a strip of main road that had lots of shops on. So we were in there talking for about half an hour and about how much I loved K'nex, (K'nex is kinda like advanced lego like bionicles or something but you build stuff with sticks and connectors) This shop carried lots of K'nex and I was somehow offered the opportunity to work a 'job' for the guy in te store. He asked me to take home and build K'nex sets then bring them back for him to display them in the shop window! It was great! So I got given heaps of K'nex like it was raining 5 Christmases at once! And I took the stuff home and got to work. This little 10 year old me was playing with/ building these toys then relaying them back to the shop each week for to be put on display in the window. In return for my building I got 'paid' in more K'nex sets which I could keep! Greatest thing ever! The awesomely thing I built was a giant working roller coaster. Size probably about 2x1x2 meters big. This green and purple monster took a long time to build, but it was amazing. Carefully put this thing in the back of the car and drove it to the store where t was displayed. I was so proud.

Can you condense the text into a few key points?
<bot>: 10 years old, building K'nex sets for display in a shop window. Got paid in more K'nex.