Some read 'I will make,' which I suspect to be the true reading, which copyists thought too bold. But many have it as in the text.
The cloud covered, without darkening them; it was bright -- the excellent glory: 2Pet. 1.17. The word is used in the LXX for the cloud which took possession of the tabernacle and filled it with glory, Ex. 40.34-35: see Mark 9.7.
hupo, the causative or instrumental power, the Son of man being the passive recipient.