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Awesome suggestions guys. Keep them coming. Any need for floors? I see some guys use exercise mats or car style floor mats. Any need for a table? I intend to have my sled inside the shelter.
What are your intentions with the sled inside the shelter?
I do this too when I am out by myself, leave everything on the sled, set up shack, anchor two corners on the same side then you can lift the un anchored side and push the sled under the shack. Saves from packing all your crap in the door. If you do pack it all in the door when you are done fishing tip the shack rather than packing everything back out the door. A benefit to having the sled inside is a place to set things without them being on the wet ice/snow. Here is another, if you plan to heat the shack pack your heater in a milk crate, take heater out of milk crate and turn the crate upside down to make a stand for the heater. Elevated heater tends to keep the ice/snow from melting.
I think most of the important accessories have been covered, but I don't think anyone has mentioned a FAN. A small battery powered fan hung from the ceiling will move the warm air down from the ceiling of your hub to more evenly heat it. A fan also helps reduced condensation.Enjoy.