Thanks for the replies, some interesting points raised.
I should add, another reason for contemplating the video tutorial was the non-emergence of a wiki. It's been talked about several times over the past year or two but nothing has come of it yet. If I was a beginner, having a wiki to refer to for information would be easier than letting a bunch of videos load up and then trying to skip to the relevant part. As Ceri mentioned, it's sometimes easier having something solid in your hand that you can take to your workbench and refer to when it comes to making stuff. If a wiki pops up now we have the new homepage, I'd welcome it and refrain from doing the videos as they would become somewhat unnecessary.

But would miss minor details such as joining/cutting materials etc.
That's one area I would be hoping to cover. The bot chassis would be Nylon so I'd mostly be covering cutting it and drilling/tapping holes. Obviously there are other different methods but I need to limit how far into these alternatives I go otherwise the content of the videos will be excessive.

Wiring seems to be the main area that people would like to see covered thoroughly. Tony mentioned this as an idea and it was the one I was thinking of: having a video on wiring that shows everything getting connected up/soldering joints etc, but then had an image file that can be linked to showing the circuit connections that can be referred to easily.

I've written up a rough chapter list so far:

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Chapter 1 - Design:

- Establish intent and design
- CAD/paper/cardboard models
- Pile of parts
- Material selection


Chapter 2 - Chassis:

- Base plate construction
- Bulkhead cutting/drilling/tapping
- Component mounting locations


Chapter 3 - Drive:

- Mounting the motors
- Melting a nut into a wheel
- Attaching a nut-insert wheel


Chapter 4 - Power:

- Mounting the batteries
- Fitting power distribution bolts
- Mounting a removable link
- Installing a power LED


Chapter 5 - Electronics:

- Fitting the speed controllers
- Fitting the weapon control
- Installing the radio gear
- Wiring the system up


Chapter 6 - Weapons:

- Making the drum
- Fitting the weapon motor
- Assembling transmission


Chapter 7 - Finishing touches:

- Test of failsafes
- Test of weapon system
- Armour
- Paint
- Practice and full-scale testing


Chapter 8 - Summary

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Hmm, just hit a possible issue. Just realised that most videos will probably come close to the 15min max limit on Youtube, with 8 chapters that could be well over two hours of footage. I doubt even the most enthusiastic beginner is going to sit for that long watching some random build a robot.

Maybe worth just building the robot and documenting it as a build diary (as per usual) but with a short video thrown in now and then to cover areas such as wiring, nut inserts or cutting/drilling/tapping.

Think I'll need to spend a bit more time considering the logistics of a video series vs. usefulness and practicality. Will mull things over during the next few days.