Please critique my sauna plans

Hi everyone.
Long time reader and first time poster. Thanks to the community for all of your insight and suggestions over the last year or so. I'm planning to build an urban backyard sauna (or have it built, really). I'll be hiring Mark at https://rytsaunas.ca here in Ontario. He's been very open to suggestions and modifications (many of which I've suggested since deep diving into this sub and buying Lassi's book). He builds very solid saunas with R20 insulation. I'm in Toronto and a bit limited in space and height, but these are the diagrams we've come up with so far. I'd love some expert input.

Re: Height. We've gone with 7'8, (92 inches) as it's the highest I could probably go without totally angering my neighbours (might even have to shrink it to 7'6). Feet should be right at the top level of the heater so hopefully this will give me a good pocket.

Dimensions. It's currenty 6'6 (78), x 7'6 (91) I believe. I may have to shrink it to 6 x 7'6 for space reasons.

Re: Heater. A saunum is stretching my budget too much, but I've decided on a Harvia Virta with the wifi controls. Open to ideas here. Also considered Kip and Cilandro but happy with this choice. What power do you think would be reasonable? I was going to go with either the 8kW or 9kW.

Wood: 1x4 T and G Aspen.

No mechanical ventilation initially. There will be 5 open passive areas. Could add later if need be.

Benches. Going with L shape for now.

Other thoughts? Suggestions? Ideas? I don't have the space for a changing area, but it'll be right beside by house, so I'm not too worried about that.

Thanks!

(Sorry, images below in comments)