Suggestions from other versions may help (or not)-

-Our Saviour must rejine:
"To our Saviour we must resign" (in Bronson)

"For the Lord is waiting for us now,
And we must go and join" (in Morris, from Florida)

back--- room:
She spread a bed in the backside room (version in Sharp, etc.)
in the backmost room- (a version in Cox)
all in the back room- (version in Morris, Folksongs of Florida)

golden spread:
probably correct, since golden spread is used in the Cox text and golden sheet is used in others.

The 'Rise up' verse is found in the Folksongs of Florida (learned in Georgia) and another collected in Florida:

1. "Rise up, rise up," said the oldest one;
"Rise up all on your feet;
For our Savior is standing, calling for us,
And we must go and join.
2. "Rise up, rise up," said the oldest one,
Rise up and let us in,
For our savior is ...."
3. "Rise up, rise up," said the eldest one,
Rise up all in a line..."