Before you mount the pj flush or close to the ceiling, you should consider the effect that will have keystone adjustment.
I don't own a Sanyo, but each projector has a fixed relationship between the center of the lens and the center of the projected image. This can be adjusted via 'lens shift' on some pj's, but if you get outside the recommended offset, you have to use the keystone adjustment.
This may have undesired affects on your image - it certainly did on computer output on my LP530. I ended up moving my projector lower (easier than moving my screen higher).
The Sanyo manual should have the data you need to calculate things.
Have you looked at the Chief manufacturing? I have ordered the RPA series LCD inverted ceiling mount to go with my projector lift. They have several ceiling plate options for fixed mounting. Chief recommends the RPA-9820 for the Sanyo PLV-60. http://www.chiefmfg.com/model_display.asp?model_id=581
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!