Try this one at Freescale.
I haven't used it but it's product specific. Find a similar FET. The data should be more reliable.
MTTF calculator available at http://www.freescale.com/rf. Select Tools/Software/Application Software/Calculators to access the MTTF calculators by product
I'll see what method our LPKF guy uses.
We regularly cut slots in test fixture components we make from board material.
I'll try to get back tomorrow and post the method.
http://www.eccosorb.com/
http://www.rfcafe.com/vendors/components/magnet_shield_links.htm
Try these sites for materials for your enclosure that may help.
The best source for the information your looking for would be a thermistor manufacturer sales engineer or try the applications libraries at several manufacturers sites.
http://www.rfglobalnet.com/content/homepage/default.asp?VNETCOOKIE=NO
http://www.rfcafe.com/
http://www.epanorama.net/
The above sites should have some information of use for your project.
http://www.newwaveinstruments.com/resources/rf_microwave_resources/digital_wireless_communication_directory.htm#Directory
try the above site....Antenna section
There may be some help there for you.
Good luck w/your project.
www.modcoinc.com
Try the above site check the information on the "VS" series.
Fill out the custom specifications form and submit it for a more specific response for your needs.
It's worth a shot.
http://www.apexmolded.thomasregister.com/olc/apexmolded/prod.htm
Try double studded Vibration Isolators. Examples are at the above site.
http://www.accurate-prod.com/grommets.htm
Another method is mount a metal sleeved grommet in your mounting plate then install your mounting screw through...