Trying to remove ATWOOD GCH10A-3E with engine coolant tubes

I have a 38' Winnebago. Had leak. Heat exchange etc. There really isn't much room to do anything under there. I just cut out the floor above it and put two small hinges on it. I have a fireplace over where I cut it out. You don't even know its there. You're going to have to make a support bracket to hold it in place when its closed. I now have easy access to it if I ever need it and everything else thats under there. Have a good day.