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If using an existing game system you have access to the "Editor" not the full authoring kit. So you can't change "core" concepts like if Modern uses 7 Abilities Scores instead of 6 no way to do that. (This is an example ONLY not saying Modern has a 7th ability score). But inputting new classes, feats, spells, and magic items would be allot easier as the Editor and all the mechanics are built.Ok, thanks. Would it be easy to modify Hero Lab's existing d20 system to Amarillo's Prime Directive d20 Modern?
It was an example hence why I said "IF". I was letting him know something's can't be change why many others can. Wealth or modern money would be another area that can't be changed.Huh? D20 Modern only used the same six attributes as 3e era D20; they had some additional things like Wealth and so on, but the attributes were the same.
I suspect it'd be a pretty good sized piece of work because of needing to replace the classes and add all the supplemental material. In addition, if that uses the D20 Modern style hero point mechanic you'd have to implement that, and probably the armors are all in class D20 style rather than the mix between that and damage reduction D20 Modern was set up for.
You can rig a source to preclude the base classes, feats, and items you don't need. It is possible to rig the base files but some features may need special items and tabs.
You still need to put all the other stuff in, though; its nice not to need to play with having to manually preclude everything that doesn't belong, but it doesn't add all the material you do want.
Every game system in Hero Lab started as a blank canvas. Somebody added all the character creation elements. If you want to turn an existing system into a new copy that has the system data you want, its going to be work. But starting with a copy of the 3.5 ogl files may be faster than building it from the authoring kit. Authoring kit is a lot of work to hammer out into a working game system.
If you have the wits, the skill, the time and the passion to learn how everything works, you can do almost anything you want. But it won't be quick, and it won't be easy.