Here's a PDF of steps for making a simple divider for a viv. It shows a step by step method of making a card template for the front edge to give a snug fit against the glass. I've only shown a single step for flush fitting runners. If there is a glass top or base fillet, just use the same technique and make allowances.
I suggest using a bit of 5mm foam board. For the pictures I used a scrap sheet of hardboard.
Don't suppose you'd like to post the photos and a little walkthrough in a new thread would you?? I'll then move to the DIY section. It deserves a better airing than a PDF.