Like every "proper" brewer, I've gone out and done stuff that I recommended AGAINST
First, my 10G Gott mashtun is nowhere near the size I need for a 10G batch. I have another 5G Gott, but even splitting 1/3 and 2/3 of the grain bill isn't enough.
So I made a keggle mashtun.
And not only that, my angle grinder didn't have a cutter, so feeling too lazy to go to Home Depot, I decided to use my Dremel. Yeah, it's taking a pen to a gunfight...
After 10 discs and not getting very far, I decided to use the sawzall. Difficult to get the correct circle.
So what it finally came down to is just abrading maybe 0.5mm with the dremel and then cut with the sawzall. Went through 3 bi-metal blades and a total of 16 discs. I also filled a White Labs yeast vial with 10W40 and would dip the blade into it after every 2cm or so to cool the blade. The blade fits perfectly into the vial!!!
So after all that, I got the Lowes water heater insulation (which isn't wide enough for a keggle) and taped it on the the "proper" tape used for ducting. After all that----15G STILL isn't enough for 10G batches. Kind of a "DUHHHH!" moment, but when you need 17G of water and then 30+ pounds of grain, it AIN'T going to fit in a 15G keggle.
So I am going the 100 Quart Igloo route. That SHOULD be big enough for any batch I'll ever make, even trying to make 14G batches of barleywine. It has wheels on it, so I can take it off the stand and wheel it around the house to the compost patch. Much easier than making several trips of grain alone before I could haul the remaining grain and the keggle out. Should be much better!
I bit my tongue and closed my eyes and darkened the steps of Walmart to buy the Igloo. They had some cool split-lid (2 lids) wheeled igloos there, too, but they were only 60Q. 80Q would have been perfect, but they don't exist. And the 70G didn't have wheels.
So I'll go the stainless braid route and MAYBE drill a hold in the top for my fly sparge apparatus. I might just batch sparge--I don't know yet.
I've got lots more advice I don't take myself!!!