Hi Clive,
Yes, it's a good start. The center section and background look functional. You'll need to add the appropriate Auctiva tags for description, seller details, and pictures, as needed.
The HTML, HEAD, and BODY tags will need to come off, as eBay provides those as their parts on the webpage.
I'd recommend use of any of Auctiva's standard templates, as a guide. Their use of tags and arrangements should work exactly the same for yours.
Danno