im a bit confused by the fact that yoru architect told you that your engineer would provide yo uwith a contract.
first question: who is inspecting the works on site? is it the architect or the engineer?
there is a standard suite of building contracts produced by the Royal Institute of Architects of Ireland, one of which should be selected by the Architect.
You can obtain more info on these directly from the RIAI -
www.riai.ie
Your architect should explain fully what each clause means .
If the Architect is inspecting the site works, I don't understand why they are suggesting an engineering form.
As to what is included, it is generally a document which sets out the roles of the builder, you, and the architect in terms of referring to what is to be done, how much it is going to cost, who is insuring what, how long is is going to take, how payments are made, what happens if things go wrong, how the contract will come to an end (hopefully with a completed building!) and so on.
The advantages of using a standard form (such as one of the RIAI Forms) is that all of the clauses have by now been tested in court, so there is certianty as to what they mean.
On the point of the builder, note that the builder should know what the proposed form of contract should be while preparing his price, so as to include any costs he may feel will arise to comply with the provisions of the contract.
If you care to read the following thread you may find something useful:
http://www.askaboutmoney.com/showthread.php?t=162636
www.studioplustwo.com