Look the bible makes it clear that all things are made by him and for him.... so yes computers are something through a person whom God created was able to be manifested. God is the reason why that person/group of people or whatever even had the intellect to lets say make a computer that really can be a useful device for finding scriptures, or watching sermons online, or keeping up with the world, or just yeah calculating things.
Now your 2nd last question... The bible says the world and the lust thereof shall pass away. The bible informs us that the flesh dies. Computers are a worldly thing... not to mention I talked to you about the good side of computers to show they can be used to spread the word of god or learn about God. But there is a bad side to them...pornography, the deep web, certain music videos, videos about why GOd isn't real etc. Additionally, computers tbh aren't perfect though they have flaws (such as the sinful content I mentioned) and limitations, so it's hard for me to really see them as perfect. I feel sure they can give us an ideal of God's perfection.... just like looking out how cells function per say can, but it's hard to find something that 100% demonstrates his full perfectness.
There are 2 key simple reasons computers won't be in heaven though, no indication of them whatsoever in scripture being there, they are 100% physical 0% spiritual.
Your last question I believe I answered, they kind of display God and what he can do but I feel we can't really fathom it as the bible states. We can't fully understand God or what true perfectness really is like here on a sinful Earth.