I can't mount it on the wall/celling it will not stand the weight.
Do you think a profesional can do something?
I was thinking on a floor mount that can go high. Any advice will help
Anyone is using a floor mount for a projector that size?
Why will the ceiling or wall not stand the weight? You have joists and studs in there I'm guessing...
Some folks have used free standing bookcases or shelving which I guess technically sits on the floor. Or if you don't need the height a table mount may work depending on your seating/room arrangement. There are motorized floor attached mounting systems that will raise up, but they will be considerably more expensive.
Perhaps you can explain your situation a bit more so we can understand why the ceiling/wall mount won't work. That is by far the most common option for mounting a projector and usually the most economical.
I think you are right, i just don't know how to do it myself.
Does anybody know of a good installer that works in the SF Bay Area?
There are lots of resources on how to do it yourself here on the forums. I suggest you do some reading. If you are even a little bit handy mounting a projecting is something you should be able to handle after becoming familiar with the in and outs.