What we are trying to explain is that when you say that the tub is out of line, it means that something in the suspension system of the machine is letting it lean to one side or the other. The whole mechanism in the washer is suspended on cables that move over rollers at the corners of the machine. One of the plastic rollers could have broken, allowing the cable to sag. It is highly unlikely that the cable broke because they are cables like are used in airlanes and are pretty tough. If it is one of the rollers, it probably would not be that expensive a fix, unless you call GE factory service. They will tell you it's not worth fixing, but quote you a high price and, in times past would say that if you don't want to fix it, they will offer you a discount of the price of a service call on a new machine. Find a reputable independent appliance repair business and tell them the problem.
As far as the mold and smell: Fill the washer with very hot water. Add about a quart of the gel-type dishwasher detergent (they contain bleach). Let it wash for the longest setting on the regular cycle. When it starts to drain, only let it run for 20 or 30 seconds, the stop it and let it sit. This gets the detergent and bleach up behind the gray rubber baffle. After it has soaked maybe 10 or 20 minutes, you can take out the filter pan (empty any gunk it caught) and use a toothbrush or similar small brush and, while pulling the bottom edge of the baffle forward, scrub the backside and the area above it which is actually the underside of the top of the washer. When you have finished that, replace the filter pan and let it continue to drain and go through the rinse. Lots of gunk is going to come loose, so make sure it is all caught in the filter pan so that it does not wind up in future loads.
I recomended dishwasher detergent containing bleach because GE washers have a tendency to oversuds with high sudsing detergents. You wil get more than enough suds from the residue in the machine that dissolves into the cleaning solution you are using, so it's easier to just use the dishwasher detergent since it is more powerful, does not produce suds on its own and already has the chlorine bleach.
Lots of luck. Hope you get to use the washer. Tom