It never ceases to amaze me how many scriptures Preterists are willing to twist entirely out of their meaning and context to support their doctrines. 
Matthew 17 (KJV)
1 And after six days Jesus taketh Peter, James, and John his brother, and bringeth them up into an high mountain apart,
2 And was transfigured before them: and his face did shine as the sun, and his raiment was white as the light.
3 And, behold, there appeared unto them Moses and Elias talking with him.
4 Then answered Peter, and said unto Jesus, Lord, it is good for us to be here: if thou wilt, let us make here three tabernacles; one for thee, and one for Moses, and one for Elias.
5 While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; hear ye him.
6 And when the disciples heard it, they fell on their face, and were sore afraid.
7 And Jesus came and touched them, and said, Arise, and be not afraid.
8 And when they had lifted up their eyes, they saw no man, save Jesus only.
It's just as Russell said. He said that the immortal body can be seen if the mortal eye is "assisted." The disciples saw Moses and Elijah because their eyes were assisted. But when they looked again they saw no man but Jesus.
You did not deal with Paul's point that when our outer man perishes we will have a "house" (body) that is "not made with hand, eternal in the heavens." He had just said that we are looking for the things that are "UNSEEN" in connection with his discussion about our immortal condition in the afterlife. Then he said that we will have the body which is "not made with hands," that is, "not of this creation."
Your example from Moses and Elijah proves no more that the eyes of the disciples were
assisted to they could see Moses and Elijah. Your example does NOT prove that the bodies of Moses and Elijah were visible in themselves. Why were they invisible the next time the disciples looked?
And why did Paul see Jesus on the road to Damascus when the others with him did not see Jesus? Answer: Because Paul's eyes were divinely
assisted. And if Jesus has the same body now that He had after His resurrection, then explain how Paul was blinded upon seeing Jesus. Did Christ's mutilated body blind men before He ascended?
It amazes me how Futurists are very
selective in their use of the scriptures.
thinker