Hello again, I'm pretty hooked on using lost foam after using this process on my 1/6 scale Demon V-8 tunnel ram and bellhousing. I have started the next project and intend to cast some more parts out of aluminum. This project is a steam engine, but uses an unique valve mechanism that appears challenging and appealing when running. Most steam engines of this type and purpose are single cylinder and use an eccentric to time the slide valve. This engine has two cylinders, phased 90 degrees and uses an adjustable cam so the user could adjust the timing lead for torque and speed, but also reverse the direction of the drive wheel (over/under). The plans were featured in an old model engineering magazine in 1905. A good place to start a project like this is the base. I scaled it down to 0.6 scale of the original so it fit my collection, and equipment capabilities of my forge and lathe. Started by cutting sides and cross webs using my shop-made hot wire table. I used hot glue and some slower setting craft glue with pins for trim and top parts. Let that set overnight with painters tape, and the next day sanded flat, and added raised features for mounting the cylinders, slide rails, main bearings and mounting bosses. I used a lathe to turn the bosses to size (1/2") and counterbored them to print using a two flute endmill on my mill. I had read about using candle wax for fillets and used that to fill some seams, tear-outs and inside corners. Last project I used toilet bowl wax and a disassembled inspection mirror for the ball on a stick. the candle made my shop smell nice, and I liked how the wax wicked into the fillets once I practiced a bit. I had to use the curved end of an engineers scale to tidy up an area where I applied too much. I then coated gated and coated with thinned drywall mud. This is the largest and thinnest piece I have ever attempted to cast. I don't think I have a big enough crucible (4KG) or bucket (5 gal). I ordered a 6 KG crucible, and can build a wood crate easy enough. I also plan on weighting the sand down so it doesn't float.