First off, the tank plus, gravel, water, pumps, etc will weigh somewhere around 950lbs. Keep that in mind.
Now, even if you dont find someone on here to make it for you, don't move forward without a sketch of what and how they will make it and stick to that plan
Then publish the plans on here so that some of our members can look at them.
Remember the 950 lb thing? That's a lot of weight on the stand and potentially very dangerous.
I wish you the best
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B