I have provided my plans for an easy very inexpensive substitution trunk to other penguinites and others on different magic sites.
These are plans I thought of one night while laying awake wondering how to make one. The illusion worked well for many years. Feedback about my plans are very positive. The plans are good for 1st time illusion builders.
Feel free to PM me about the plans ro other questions you might have.
So you would give us your plans for free? That's awesome, really nice of you, I'm interested!