Can you get by with only one box and get a test box after the implementation is done? The answer is a feeble yes, and a strong no.
If you had a great multiprocessor, with lots of processing power, and large amounts of disk space, you could get away with installing two instances on one box, although it's not recommended. However, you indicate that you only have two volumes, so it sounds like you may be trying to squeeze things in.
Also, you don't indicate what your hardware resources are. You need to check out the installation documentation available on Metalink, as the details are resource specific.
On Metalink, doc id 215868.1 points you to all the docs on Oracle Applications. You need to check the specific installaton requirements and guidelines for your platform.
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