Sarge,
Those rules are based off of SAG's setup. If you're not using SAG or other Union talent, the rules are much more flexible. When using Unionized talent, you need to get one of the agreements setup as mentioned in the article. Just be advised there will be a bunch of stipulations regarding SAG being able to take control of your project if you deviate from their rules and the expectations of compensation.
When using non-union talent, obviously you want to take into account your budget but one thing has to be clear; nobody gets paid more than the person putting up the majority of the money and resources on the project. That means if you are wearing 3 or more hats that include; exec producer, director, etc. no one on the project should be getting more than you do. Now with that in mind, you take the base pay rates from the SAG listing and break it down per hour and adjust it to your budget.
Remember, the biggest expenses that come with talent are; compensation, housing and meals. For the larger outfits, Per Diem plus Lodging are paid out in cash disbursements during the production. More than likely you won't have the budget for that. However, if you are providing suitable housing (suitable is a very flexible term) and meals, then you can get around paying Per Diem and such.
Lastly, even though you're not paying non-union actors the same wages as required by SAG, you don't want to fall too far below standard state wages for similar gigs in your state. Make sure that whether there is pay or no pay, you have everything laid out in a Plain English Contract / Agreement laying out what the compensation will be in any form and the schedule for when it should be expected. And stick to it! You'll be surprised at how many actors will be willing to work with you again long as they know they'll get a square deal from you. When you are in a position to have a larger budget, then you can pay more.