Technology is a relatively new subject for Leaving Certificate students. It combines disciplines from various other subjects and the practical project has a lot less restrictions than other practical projects in engineering and construction studies. What you make is up to you, provided you satisfy the brief.
The practical project and portfolio make up 50% of your overall grade in this subject so it is vital that you give it your best shot. If you work hard and meet your deadlines, you will succeed and do well.