No issue re: power, no. My Vostro200 Power supply is rated under 300W too.
We don't support those methods you've mentioned, they have their own dedicated web site. Here we support and advocate myHack... All I can say is you may not need a DSDT table if all your hardware appears detected & functional (eg: graphics, audio, etc.) and all expected features operating normally (eg: restart, shutdown, sleep, wake, etc.). Our bootpacks are a facility we provide for models we've setup and tested in order to ease installation for the mass, but it's nothing magical and anyone can, in theory, come up with a bootpack. They only require a bit of knowledge and experience.