I do like the design. Quite a lot. It's modern and sophisticated. I really like the subtle detail of the base top being inset to create a reveal right under the sunmica top. I assume the width and length of the sunmica top is exactly the same as the base, it seems that way from the drawing. I like that too, it makes the reveal more purposeful. The short sides are best left plain as i think you planned. You don't show the short side so I'll assume the base connects at the top and bottom, and the field open. I like the antique polished gold for the base. I like it in concept, I don't know the room it will go in. You're very on track, so I'm sure that is the right finish for your space. For the top carving, again I like the deep brown polish. I think it adds more to the piece by having another finish. I'm curious about the overall height. What is it? Also, the table is large. Not huge, but large. I don't think you need to make it smaller, I just want to bring this to your attention so you make sure it will fit in your space properly. Finally, the mirror. Are you using a plain mirror? Smoked glass mirror or a mirror with a slight antiquing would be great.

A houzz contributor, not too long ago, had made a wine rack out of 4'x4' wooden pallets, that are used in the US to move a load of goods with a fork-lift truck. Perhaps they have them in your country. He cut them in half so they were only two feet deep and stacked them up to high counter height. The wood would be a nice contrast with your concrete, might add a little warmth to the space. cascio.offsite@gmail.com

I think a comfortable distance between the island and the counter is around 42". It seems that you have only 30" between your cook top and the counter. I might be a little too tight. The wall between the entrance and the kitchen could be 4' long instead of 6', you would then be able to move the island a foot which would give you more room between the cook top and the island. Could you switch the location of the toilet and vanity in your dad's bathroom so your enter facing a vanity instead of a toilet which is a lot nicer.

Going with professional has its own advantages. Afterall he is pro, so he has studied more and has more experience. However is this person from the kitchen shoppee, which is giving you quotation of kitchen installation? In such cases, I have experienced that they just make boxy kitchens where they add lotsa fittings, that increases your budget. Open shelves does not need such fittings, so such are omitted...Normal door wali cabinets are less and number of drawers increased. Going on own is not a bad idea, provided you need to study it well. Note down the requirements, classify work areas and so on... In this approach , you have to go bit slower and carefully. Allow some flexibility in design, so that in future , you can alter as per the need. Sometimes we come to know the problems after few months/ years and we cant change it later. Ultimately compare between [your time+ efforts+ study+ error chances] Vs Hiring professional and go ahead accordingly.