I think you are OK.
I recommend setting up the cage and panel as a fully assembled unit. If you are going to be home let it run at full power for a few hours and then set your stat. It does take a little time to heat the cage and all the substrate. The panel will likely work hard in the beginning and once it hits the desired temp it will pulse to maintain it. The cage may smell like the panel, and the heated cage may have a scent as well.
Once you have the decor and substrate in place, the cage will maintain heat very well.
You are wise to consider all safety hazards. A good stat is a must. I have a VE-300 and two Herpstats. All work very well and rarely do my panels run at 100%. If they do it is after misting with the doors open. Once they hit their mark they shut down and use the least amount of power to keep the desired temp.
I'm running Pro-Products panels but I imagine things don't differ greatly from yours.
If you have a room where you can use an ambient heat source it will assist the panel and keep it from running frequently.
Reply With Quote