Almost no special tools required - You will just need standard electronics workbench tools. However, you will need a Very Small crosspoint screwdriver to open the servo.
Brass strip - 1/32" x 1/4" x 8"
2 offcuts of copper strip stripboard
M2 (2mm) nuts and bolts
Micro RC servo (7.5g) with horns and screws.
3 Volt relay - I got mine from Farnell (9899600
(They no longer do PCB mounting. This is the SMD version - smaller)
2 x miniature microswitches. Mine came out of a couple of CDROM drives
2 x LEDs - I used red ones. (Blue or white may not work in this application)
1 x 100R resistor (Use 47R if using yellow or green LEDs)
2 x AAA battery holder and batteries
Thin link wire
In the UK we use both Imperial and metric measures. Personally, I tend to think Imperial but measure metric. As a quick reference, 3mm is 1/8" 25mm is 1" 305mm = 1'.