I needed several lens boards for my Bes. 45 enlarger so I looked around the shop and found some 1/8" plate aluminum, from an aircraft surplus outlet, and proceeded to mill them. First I cut the plate to size, did the layout, cut the hole and finished the first one. It took an hour. One hour to get a lense board. They are quite expensive unless you buy them off eBay. I got tired of waiting and mine are ever bit as good. It just took longer than I thought to make them.
Making anything takes so much longer than expected. It can chew up a lot of time. Now sitting down and making a field camera from design to drawings to shop to finish can really take a lot of time. If it is done "on the side" in "spare" time it can take what seems like forever. Time really is again the determining factor when you say "I can make that for a whole lot less". I hear myself saying that in my head all the time. Then I step into the shop and start looking for material and parts and on to machine setup and adjustment etc. It's a reality check.