@ubuntu - a more feasible arrangement would be reimbursing the contractor at pre determined stages as opposed to after completion of the work.
Anybody who goes with the latter option will make you pay through the nose.
Drop a mail to
info@modelsandrenders.com with all the details and requirements you need and also for you to be forwarded the contacts of contractors(agreeable to the arrangement)
I am of the assumption that you have all the drawings and approvals.
'Whatever can go wrong will go wrong,and at the worst possible time,in the worst possible way.' - Murphy
"We do not inherit the earth from our ancestors, we borrow it from our children" Native American Proverb