Actually, there is a free Eng-Thai, Thai-Eng dictionary named "Lexitron". The website allows you to download the dictionary database, source code for Linux, etc; but you need to register first.
http://lexitron.nectec.or.th/2009_1/...nager/download
However, the website is in Thai; so if you want me to download and send them over to your engineer, please let me know. I'm more than happy to do so.