spiral staircase for loft

Getting there
I was at the store this morning discussing underlayment with the salesperson
I told him it didn't need the stain barrier on there since the kids aren't allowed to eat up there anyway
Then my wife pipes up and says "she was eating up there yesterday"
So, we got the stain barrier

I need to pick up some trim, and some smaller staples for the base of the stairs, but all that is left (carpet wise) is the top of the base, and the steps

The base will be the same purple as the loft, the steps will alternate between pink and purple