I know the area well. I built a shop in Chilliwack. We now live on the coast where I built a shop once again.
I'll make a few recommendations. All of these are assuming you want to save a bunch of money doing the bulk of the building yourself.
FOUNDATION. Build a footing and a four foot concrete wall. Right now concrete is a lot cheaper than conventional wall building and finishing materials, so it's the cheapest way to go vertical. Other benefits are your wood will be further from the ground and can't rot. Another is you will have a durable interior where you are likely to damage it with a jack or a car or something. Unlike with a monolithic slab, you can enclose the building first and then poor the finished floor under any weather condition.
FLOOR. On a compacted base I would lay 2 inch high density styrofoam then a 6 ml vapor barrier, then pour a 5 inch non reenforced slab. I would put control cuts in the finished floor. How many is really up to you. I did this in my present shop. It really keeps the heat in and the dampness out. You know how soggy Hope can be.
WALLS. With eighteen inches of frost protection you will now have 2 1/2 feet of concrete above grade. Build an eight food stud wall. I know this doesn't sound very tall, but read on. This will be a cheap wall and very quick and easy to build and stand up. Combined with your 2 1/2 feet you will now be 10 1/2 feet high around the perimeter. This makes it easy to finnish the exterior and easier to get up on the roof to build it or maintain it. It makes a fall from the roof less life threatening. It also makes the building less imposing on the landscape.
TRUSSES. I recommend an engineered 5-12 pitch scissor truss. This would make the roof angle easy to walk on. On the inside, it should give you just over an additional 5 feet of ceiling hight down the middle of the shop. Adding it all up, now you have over 15 1/2 feet and thats plenty of headroom for a lift.
ROOFING. I'd go metal. They are common out your way so it would be almost as cheap as asphalt and would go a whole lot faster. This is where I would hire a contractor. They want you business.
HEATING. Look into propane or natural gas radiant. You know the overhead tube type. With the insulation I mentioned, the floor will be warm enough for bare feet even in the dead of winter.
In general, I think by going conventional wooden stud construction, you can do it yourself, complete it as time and money permit and you can take advantage of some sales, as this is the most common construction method and therefore materials will always be priced competitively.
Good luck.