Well, yes, it's possible.... but. That large amount of complex valleys, trim, and underlayment, will not be inexpensive. The flat metal is the cheapest part of a metal roof. It is not going to be easy to erase the home's identity and move it to "farmhouse". It has almost nothing in common with a classic farmhouse. It's pretty nice as an updated ranch though.

If it is ordered correctly, there is almost zero waste. You don’t order by the square foot like shingles. The lengths come precut to the exact length needed, and all that needs to happen are some site trimming for angles for hips. We had 32 foot lengths for some of ours. We used the exact number of pieces calculated to be needed, and only had the one length left over that we had ordered in case of damage. It’s the trim pieces that you need to allow a goodly percent for waste. Those things are where all of the dollars are in metal roofing.

I watched all the videos, I know what the difference between the standing seam roof and expose fasteners, i know quite a lot of details about the standing roof installation, and now I know that my roof is not installed properly. I think the builder/general contractor should not have approve this job as done. There are many other thinks they now are asking the roofer to fix after the siding installer refused to put the siding. The builder says that the instalation (exposed screws through the roof and seems, no gable rake or other trim ) is acceptable, and I've got a standing seam metal roof. How much trouble the exposed fasteners will couse mu, how much less the roof will last? We were paying more for the metal silver roof to have it more environment friendly, long lasting, recyclable, reflecting the heat and reducing overheating of the urban area.

True standing seam requires tools that a DIY person will not have. Consider a snap seam instead. Similar look and far easier to install. Here is one source that I use for all my metal roofing needs, and I've installed this type of roof. Most metal roofing suppliers have a similar product. https://www.metalsales.us.com/products/vertical-seam/ You will need to find a real lumber yard, or contractors supply -- even my local Ace Hardware can order this. You also need to know enough to create your own order, specifying all the materials and dimensions as the roofing is cut to length. Trim comes in standard lengths. You can find installation guides and other technical specs on the product page.