You could look at height adjustable stools, like these from all modern.com http://www.allmodern.com/Adjustable-Height-Stools-C1768241.html or these from Restoration Hardware - http://www.restorationhardware.com/catalog/product/product.jsp?productId=prod690094&categoryId=cat280014 Here is a link that might be useful: Restoration Hardware adjustable stool

we are just finishing a 2-level peninsula similar to your plan. will post pictures soon. we were well aware that this is "off trend" but figured that by the time the kitchen is finished, it will be almost back "on trend" again! you just have to go with what you need to function best. hiding all the s*#% (stuff) from the dining area was big for us. we also really enjoy sitting at a counter. my husband makes pasta a lot and likes the idea of having 2 levels-- one to work on, and one to dry the pasta on. we put outlets all along the 6in. support, as you had mentioned above. we also put one outlet facing toward the bar side (also in the support) which i think will be handy. i also had an idea (after the fact) to build in a little soap/sponge holder into the 6inch support right by the sink. it would have been nice. ah, well. next kitchen. as mentioned and shown above, we also used hidden brackets for support. they are routed into the side so the face piece went over them and then the under-counter part of the bracket does not show at all. we didn't have room for the corner bar section that you show in the last picture. i like the look-- it does seem to update the bar look-- but don't know how it would work for your situation. have fun! kawh

helou, I emailed you back with info but will include some details here for others. I do love my stools, but I only needed two, so I could (sort of) justify the cost. They are made by Trica in Canada. The style is Champagne and is of brushed steel (looks just like stainless); I chose black vinyl seats because I just knew I'd spill flour or other goop on fabric ones, and leather was about $75 additional. I got the 26" counter height with memory swivel. The upcharge for the memory swivel ($15-20?) was worth every penny, as the backs always look neat when no one is seated. When they arrived, (seats needed to be bolted to backs) my machinist brother-in-law looked them over and also noted how well they were made. The list price is about $500 each, but I found them for around $280 including shipping, through an online source. I don't remember the company I bought them from, but you should be able to get a good price with some digging. I decided to bite the bullet and buy this expensive a chair because I only needed two and these also had excellent back support that I would need while prepping food. I saw different Trica chairs at a local dining room showroom and was impressed with the quality. I found this particular style by looking through the catalog. I actually brought home four different stools so I could narrow down wood vs metal, contemporary vs. traditional, and height of backs with relationship to the view from different angles. I feel a bit guilty for buying them on-line, but the most I could get off from the local retailer was 20%. If you can't find a source for them at a better price, email me directly and I'll dig for my purchase info. My stools are prettier in person than in the link below. Here is a link that might be useful: My counter stools at more expensive source

https://www.houzz.com/products/gdf-studio-shea-wood-and-iron-rustic-swivel-bar-stool-set-of-2-prvw-vr~58771899 https://www.westelm.com/products/alden-bar-counter-stools-h1755/?catalogId=71&sku=8188349&cm_ven=PLA&cm_cat=Google&cm_pla=Furniture%20%3E%20Bar%20%2B%20Counter%20Stools&kwid=productads-adid^215320075618-device^c-plaid^348669715348-sku^8188349-adType^PLA&gclid=EAIaIQobChMI2Ja_-fLP1wIVS1cNCh3XgQfjEAQYEiABEgJJavD_BwE&cm_ite=[[PLA]%20-%20Good%20Desktop] https://www.wayfair.com/furniture/pdp/trent-austin-design-gonesse-3075-bar-stool-tadn4281.html More similar: https://www.grandinroad.com/tractor-swivel-adjustable-counter-stool/810218?SourceCode=ZZ348076&cm_mmc=Comparison+Shopping--Google+Product+Listings--NA-_-NA&intlShippingCtx=US%7CUSD&CATARGETID=120245400000217748&cadevice=c&SourceCode=ZZ51121&gclid=EAIaIQobChMI2Zfg0PLP1wIVxSOBCh1UTANOEAQYBCABEgLFMPD_BwE Sorry, can't help with the dining chair.