As others have mentioned, getting the OTA out of the fork arms is easy, but getting it back is the difficult part. You need to ensure the DEC axis is orthogonal (perpendicular with the RA axis) otherwise you point accuracy will be "out of wack".
There are some procedures to follow to get things back in line -
http://www.mapug-astronomy.net/Astro...ent/OTA-1.html
I've done this with a Nexstar 11. I removed the OTA and put in on a Losmandy Titan with no problems. Getting it back was easy as the OTA has two pins on each side that must align for it to be re-mounted in the fork arms. This makes the whole process much easier. Don't think Meade has such pins to assist the user so you'll need to follow the directions above to get things re-aligned. Alternatively "ditch" the LX90 OTA/Fork combination and buy yourself a dedicated OTA. You'll find that the capabilities of using the G11 instead of the fork arms a real benefit especially if you're planning on imaging. The low PE of the G11 will beat the LX90 fork with ease. All comes back to what your intentions are and whether you're comfortable in taking the risk (which IMHO I'd consider low).