Architectural plans for bathroom remodel

We are looking for professional architectural plans to remodel our bathroom. I have uploaded photos of our existing bathroom and a rendering of our initial remodeling idea. BUT, we have changed our idea so that instead of a bathtub, we want a sauna in that space, next to the shower. I have uploaded a photo of a side-by-side shower/sauna combination that we would like our bathroom to look like. We have a skylight in our bathroom. I have uploaded a sketch showing where the skylight is located. I have upload our original blue print of our existing bathroom. We want our new shower to wider than our current shower -- but we can't go under the skylight. The new shower should be 5'6" deep. The sauna won't be as deep as the shower, because we can't have any part of it under the skylight. The long side of the skylight is 58" from the back wall, so the sauna should probably be a little less than that -- probably 56" deep. After we define the floor plan, I will need the elevation plan also showing all four walls of the shower and sauna. The sauna will have heaters embedded in the walls. I will upload information about that. Basically, the panels toward the back are all 43 1/2 " x 25 1/2" and are mounted vertically above the 18" sauna bench, so the top of those panels would be at about 64". The panel on the right would be against the existing window. Then there is another panel against the existing window, and that one is 25 1/2" x 25 1/2", so when mounted above the 18 high bench the top of it is at a nominal 44." That's good, so there will still be window space above that panel so we can still look out the window. I will sketch those elevations if needed. The project is to have professional plans. In the shower, the controls should be on the left close to the door. And we want a horizontal niche across the back, like the one shown in the photo.