450 SqFt Massage Building Foundation Engineering & Architectural Permit Drawings -- 2

I am seeking assistance with drawings and engineering some aspects of a small massage building to be built on our residential property. We have created a layout, floorplan and rough design that works for our needs. We are looking for someone to design the pier & beam foundation to the required specs, and to produce all the drawings required for building permit approval in the Regional District of Central Kootenay in BC, Canada.

Some more info:
The roof structure will be engineered by a local truss provider.
The building will be self-built by the homeowner
Homeowner has experience with large renovations and small builds.
The foundation/ floor structure needs to be engineered for 4.8kpa (small Commercial) and there are some floodplain requirements.
Pier & beam foundation will be skirted, insulated, & conditioned to protect plumbing, with radon mitigation.
Heating will be mini-split heat pump with gas fireplace secondary.

I have provided our preliminary drawings to give an idea of the building design.
We are not seeking project management, we need permit architectural drawings and engineering for specific elements. This is a small DIY project that needs help to get permits approved.

I can provide more information if you are interested.
Cheers!