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In 2004 during the d20 boom Mongoose published under the Open Gaming License the Mongoose Pocket Player's Handbook and the Mongoose Pocket GM's Guide, which, combined, were, essentially, the d20 SRD minus, I think, the monsters. An RPG.net review of the former is here.
Dungeon Master’s Guide pg. 288 has this: Adding New Abilities A creator can add new magical abilities to a magic item with no restrictions. The cost to do this is the same as if the item was not magical. Thus, a +1 longsword can be made into a +2 vorpal longsword, with the cost to create it being equal to that of a +2 vorpal sword minus the cost of ...
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