Here are some useful goodies I've acquired aver the past few weeks.
First, tying up wires under the layout is a pain. You're working upside down and trying to glue, screw, or nail whatever you are using for an anchor. I've been stapling cable ties in place but it's hard to keep the stapler and tie aligned when you're in an awkward position. So here are a couple of different cable tie anchors I found on Amazon that make things easier.
The first one is a saddle-type bracket that mounts with a #4 pan head screw in the middle. This one is sized for a 4.5mm tie; they come in other sizes. Five bucks a hundred. The picture on Amazon shows it as being black, but the text does describe it correctly as white.
Next we have one that's even easier to mount, a two-way bracket that has an adhesive backing. As you can see in the photo, you can insert the tie in two different directions. It also has a hole in the middle if you want the added security of a screw. This one is also for a 4.5mm tie and takes a #6 flathead screw. You could also use a pan head, but it is countersunk for a flathead. You can get the same thing in hardware stores, made by GB. The GB one looks like better quality, but it's three bucks for five, so the one from Amazon is cheaper at $9.54 for a hundred.
Here's a specialty pliers for extracting screws with buggered or broken off heads. It is imported to the U.S. as the Vampliers, but the "Engineer Screw Pliers" shown in the photo is the exact same thing in Japanese home-market packaging. The actual seller is in Japan, but you can order through Amazon and shipping is reasonable. It is a lot cheaper to get this version than the identical Vampliers. Comes in several sizes and variations. This one is for smaller screws like we have on trains. $20.67 on Amazon with free shipping.
And finally, some very different cyanoacrylate glue. Drawbacks of ordinary CA glue include a very short working time and a total lack of flexibility in the bond. This "Hyper Bond Medium Flex" is a medium-heavy gel with a working time in minutes rather than seconds. You will generally want to use it with a kicker, it's so slow. It is much better at gap filling and making difficult repairs than any other CA glue I've tried. The other bottle in the picture is advertised as a super-high strength and flexibility adhesive reinforced with black rubber. I haven't had occasion to use it yet, but I can certainly see some applications. I got this stuff on eBay. The seller is an outfit called Rabid Models that makes R/C models. Many of their CA glues are advertised as foam safe. There eBay store is here: Rabid CA Glue. They also have a web site but it doesn't seem to have the full assortment of adhesives. They also sell a plastic prep solution, which can be hard to find in hardware stores and hobby shops.