No Danny, it's not easy. To keep properly up to date you need to be working or active in your field of study. Once you start a career you will be fully involved in that and you won't have time to keep up to date with a another field. A couple of hours each fortnight is fine for a casual interest, but not for a rapidly evolving professional field such as engineering - particularly if your only experience is academic.
Danny, this is fact not conjecture; it is backed up by many years of experience. An engineering (or other professional rather than academic) degree that is several years old which has not led to employment in that field will have decreasing value as a fallback qualification as time passes.
At the end of your summer holidays you will be worrying that you've forgotten much of your first year's studies. Imagine how this feels 10 years down the line, especially when you haven't even read a subject-specific journal or spent a day using your degree.
Scroggs