I really like the idea for the community page. I agree with you that a few little things could still be optimised.

I opened the DU page on your server. I have the following suggestions:

• The profile picture could be a little smaller.
• The font could also be a little smaller, especially for the fields "subscriber", "rewards" and "poster". The labels takes up too much space.
• The space saved could then perhaps be used to place the "moderators" and "logs".

Question: Why is the profile picture not displayed on DU? On the Korean site works it fine.

For images that are shorter, there will be additional white space between the content and the voting bar.

As you say, it doesn't look good with shorter images. I would suggest fixing the image size and scaling the images without distortion.
Another alternative would be a longer text. However, the extractBodySummary function would have to be modified for this. This function ensures that the text from the body field is cleaned and shortened. Customisation would probably be difficult here, as the free space is only controlled by CSS.

By the way:
If you have reached an intermediate status again that I can integrate for testing, you are welcome to send me the branch link. The PR version is currently running very well on https://steemit.moecki.online. So I'm a permanent tester ... and maybe some others on this server :-)