I was recently at Outdoor World for their ice event and I purchased a great hub style shelter, it's lightweight and easy to put up. I got it for $150 without the floor, with floor it was $300.. The problem with the floors they put in these shelters is that the hole placement isn't always ideal...
Here is the Solution....
You can purchase workspace flooring that fits together like a big jigsaw puzzle, I found some at Stites Variety on C.R. 130 outside of Bellefontaine... The package includes six 2'X2' tiles that are around 3/4" thick. You can place tiles anywhere you want and choose your ideal flooring pattern. This not only puts an extra barrier between you and ice, but it also serves to protect your investments i.e. Transducers, rod and reel, etc.
If you're not from the Logan County area you can probably locate this type of flooring at home improvement stores, and I know it is available online.
Good Fishin'
RatherBe