You need an attorney. It sounds like you are entitled to some kind of mechanics lien. These types of liens have very specific procedures which if not followed correctly result in a void lien. Would you want a lawyer performing technical engineering tasks that you are certain they wont get right? Hire a professional so you have a chance to get paid.
Don't listen to an out of state lawyer. Mechanics liens are specific to state law and apply to real property. There is not enough information here to answer if the question were asked in my state. Talk to a local attorney for help.
Mr. Goldstein is a Virginia-licensed attorney only. The information is not, nor is it intended to be, legal advice. You should consult an attorney for individual advice regarding your own situation. Answering this question does not in any way constitute legal representation. Contacting Mitchell Goldstein or the Goldstein Law Group does not constitute legal representation, nor is any information you provide protected by attorney-client privilege until otherwise advised.