Oh how I love these "How about producing..............." threads. Reminds me about why I am still in HO. 
So, ya want some Gunderson Maxi-Stack IV cars and 53' containers? The box car of the 21st century? Lets see what we can learn about pricing from the HO world.
http://www.katousa.com/HO/MAXI-IV/index.html
Kato makes an outstanding set of these cars in various paint schemes. MSRP $105.00 for a three car set. Now you would probably like some containers to put in there, right? Those are $30.00 for a two container set.
So, if you want to fill up the train, in HO, the MSRP is $195.00 for a three car set.
There is no way that ANY manufacturer is going to be able to do $195.00 for a three car set in O, with containers, as the volume will NEVER be what it is in HO. But lets assume that there are enough modern modelers in O scale that you could at least convince the likes of Atlas, Lionel, MTH, or Weaver, who have done a lot of injection molded freight cars over the years. Lets further assume that it gets done in the orient, to a detail level equivalent to the Kato HO models.
For a conversion factor for HO to O scale, lets look at the old time tested car that is done in HO to a high detail level by Intermountain, and in O by Atlas and MTH, the 1937 AAR box car.
The latest MSRP from Intermountain on an HO car is $34.95. The MSRP from Atlas O on the same type of car is $76.95 in two rail (lets compare two rail to two rail, shall we?). So, doing the simple math, $76.95 / $34.95 = 2.2017, so for simplicity, lets say the O scale model will cost 2.2 times the HO model.
Now, taking the $195.00 and multiplying that by 2.2, the cost would be $429.00 per three car set with six containers.
Want to hold out hope that MTH can do it cheaper? The PS-1 box car is roughly equivalent to the 1937 AAR, and the MSRP on a PS-1 is $59.95. So probably the BEST price for MSRP you could hope for is $59.95 / $34.95 = 1.7153, or 1.7 times the HO model. So, $195.00 x 1.7 = $331.50.
Now to give just a little bit more hope, lets assume that best case, that you will get 15% off of list price, that gets you down to $281.78, plus tax or shipping.
Want 10 of these bad boys to run behind your GP60s? It will only run you about $2817.80, plus tax and / or shipping. 
And if you are a builder in this scale, like Atlas, they would invest in the tooling, and a year later Lionel or MTH will make the same identical car, and cut the pricing. Huge incentive to invest, isn't there.
I sure wouldn't be risking my money.
Scott is better off continuing doing what he is doing, it is a small enough market that he doesn't have to worry about the big dogs wanting in, as the market is too small for them.
Want to do these in resin, brass, or 3D printing, the price only goes up from here.
Enjoying the above link.
GNNPNUT
