Form 1 suppressor sa really becoming easier and easier. Basically every part is available online nowadays to construct one. Tubes, baffles, adapters....everything. All you need to do is decide what your needs are and what style of baffle you want to use. We built many Form 1s back in the day when cans were exorbitantly expensive but honestly the price is coming down to not a LOT more than the price you would need to pay for parts. Of course if you are a machinist and capable of building your own from scratch then the savings will be much better. Of course this is all depending on what you are looking to build.
The lead times on a form1 home built and a regular form are the same so get a couple sent in if you want to build a couple. All you need to do is serial number the tube and give them the dimensions and caliber. After your paperwork comes back you can take your time in assembly.