Hello
Since there is no restricted jobs anymore in applying to MPNP, you may try to apply. For sure you have transferable skills you earned from your present job or from your previous jobs that will suit a job or jobs in Manitoba. I know few applicants who got their approvals in the same field as yours. My brother is an Ordinary Seaman and he also plans to apply late this year.
Check this link to search for a job title having the skills you have now and indicate that as your intended occupation when you apply: http://www.workingincanada.gc.ca/show-search-results.do?source=mb-immg
Try these links to know if your are eligible to apply and if you meet the 60 points required score:
http://fluidsurveys.com/surveys/immigration-surveys/mpnp-survey/
http://www.immigratemanitoba.com/asset_library/2013/03/manitoba-immigration-mpnp-points-worksheet-interactive.pdf
Read the official website of MPNP and if you need any clarifications just post it here.
http://www.immigratemanitoba.com/how-to-immigrate/
Good luck and God bless.