The clause of an abstruse structure

The narrator recalls his childhood, now of his early time in Salem House, the boarding school near London.
He was called before his senior J. Steerforth, entrusted all his money, seven shillings to him.

"Well!" said Steerforth. "We must make it stretch as far as we can, that's all. I'll do the best in my power for you. I can go out when I like, and I'll smuggle the prog in," With these words he put the money in his pocket, and kindly told me not to make myself uneasy; he would take care it should be all right.
He was as good as his word, if that were all right which I had a secret misgiving was nearly all wrong?for I feared it was a waste of my mother's two half-crowns?though I had preserved the piece of paper they were wrapped in, which was a precious saving. When we upstairs to bed, he produced the whole seven shillings' worth, and laid it out on my bed in the moonlight, saying:
"There you are, young Copperfield, and a royal spread you've got."
[David Copperfield by Charles Dickens]
I can't analyse the underlined clause at all.
So I'd like to listen to your explanation of the clause's structure.
Thank you in advance for your help.