I am thinking about making some homemade tank cars. Can someone suggest where to find center domes, platforms, and ladders.
Also open to suggestions on how to scratch build thes items inexpensively.
If things go right I would have tank cars that I can swap out different cans of soda or other beverages for a different look at a whim, and a readily available beverage 
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Several years ago, there were "kits" available for doing what you have described. The "kits" provided the trucks, frame, etc. -- you provided the can. Wish I could remember the source. Hope someone can help identify those "kits" for you.
I am thinking about making some homemade tank cars. Can someone suggest where to find center domes, platforms, and ladders.
Precision Scale makes everything you need except for the tank. You can still find the Walthers parts for most of a tank car as well at swap meets, shows, and on eBay
Also open to suggestions on how to scratch build thes items inexpensively.
Take a look in the plumbing dept. at HD and/or at the electrical conduit tubing - makes an excellent tank, 
If things go right I would have tank cars that I can swap out different cans of soda or other beverages for a different look at a whim, and a readily available beverage
Beer can tank car kit was available years (decades?) ago from Walthers. Every so ofter you see one on eBay or at a swap meet
I didn't even know beer can tank car kits used to be a thing. I just thought it would be afun project.
I looked at the wesite for precision scale but I did not much in the way of tank car parts.
Might be easier and less expensive to locate a used Weaver 40' or 50' tank car and use all parts except for the tank to create your custom tank car.
Try Atlas O. Their parts diagrams and parts lists are on their website. They usually have parts in stock. If you phone in a parts order you will receive them in reasonable amount of time.
I didn't even know beer can tank car kits used to be a thing. I just thought it would be afun project.
Just when you think you've had a new idea, you find out that someone else beat you to it a few decades back.
I looked at the wesite for precision scale but I did not much in the way of tank car parts.
Only a very small part of the PSC catalogs is actually up on their web site; the majority of their items are only listed in their paper catalogs.
Other option is locate an older Walthers kit that supplied a dowel for the tank and replace the dowel with some plastic tubing. Of course, if you're good with sanding sealer and take your time, you make that dowel look pretty good.
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