Hi Don, I don't know if I can give you anything new on this, but here are some thoughts on it.
John 1:18 No man hath seen God at any time . . John 4:24 God is a Spirit; can He be seen?
Isaiah 6:1 In the year that king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple.
Isaiah 6:5 Then said I, Woe is me! for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts.
We see this same LORD Who is Jesus in introduced by John the Baptist. Isaiah 40:3 The voice of him that crieth in the wilderness, Prepare ye the way of the LORD, make straight in the desert a highway for our God.
1 kings 22:19 19 And he said, Hear thou therefore the word of the LORD: I saw the LORD sitting on his throne, and all the host of heaven standing by him on his right hand and on his left. This was a prophesy of Micaiah probably in vision.
John12:41 These things said Esaias, when he saw his glory, and spake of him. This was a prophesy of Esaias.
Rev 4:2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne. Now this was Jesus on this throne, and of course He could be seen, but then isn't Jesus the image of the invisible God according to Colossians 1:15?
I would then have to ask if Moses was allowed to see the back parts of God; was that Jesus before He became man? We read in Exodus 33:23 And I will take away mine hand, and thou shalt see my back parts: but my face shall not be seen. At this Moses' face shown so that he had to wear a veil.