Thank you for the tip. The floor is not critical path just yet so I will procrastinate that a bit longer.
I plan to do an axle
flip to get some more clearance off the ground.
Subsequently, I also plan to switch out the black tank (which was above floor under the toilet and was about 6gallons) to an under the floor style. I think I will just remove the original grey water tank (about 9gallons) (first picture) and put a larger tank (34gallons) in its place that functions as both a black and grey.
I also plan to put a larger (34gallon) fresh water tank (3rd picture) under the floor instead of the above floor original (22gallon) (2nd picture)
I hope it is ok to have just one waste tank instead of grey and black tanks.
I also hope it is ok to have the fresh water tank below the floor while the pump will be above the floor... need to figure out how that will work.
Lastly... I am not sure how to go from polyethylene to abs... I was told it can't be done, but I don't believe that can be true...