Raised Garden Beds for Wheel Chair Gardener

[redknight]

Sorry, I couldn't find out how to start a new thread so I decided to try this.
I am in a wheel chair so I am looking for simple plans for inexpensive home made raised beds. The kind I can put my knees under. We have much community gardening here, so I need simple inexpensive plans. I can imagine such beds ok until I get to the drainage problem. I see bottoms with fair sized holes and plastic screen to keep the soil in.
I saw a link in another post that was supposed to lead to a pdf of such plans, but instead led me to a site called ripway which had no pdf and didn't seem even remotely having to do with gardening. Perhaps someone accidently posted the wrong link.