First off: "T5 Lite" exists already, and is called "Mongoose Traveller"
[...] Under FFE copyright you can create and give away a quick guide to T5. You couldn't sale it though. One page wouldn't be enough [...]
Challenge accepted. An earlier poster considered these the most important bits:
1. How do you create characters?
2. How do you resolve combat?
3. How are non-combat tasks handled?
For T5, this is relatively easily answered, and in far less than 1 page:
1. Use Mongoose Traveller, and multiply the final skill levels by 2. Or use my nifty mapping scheme, mentioned in a different thread. [Or use Classic Traveller Book 1, and multiply the final skill levels by 3 or 4.]
2. Combat is a task, where difficulty = range, in dice. You can number the CT range band distances, 1 thru 9, as difficulty 1D thru 9D, in a pinch. If the target size (sophont=size 5) or weapon range < range, it's out of range. Use CT weapon damages. Armor requires a couple extra sentences...
3. All tasks are multiple dice, roll under the asset, which is Characteristic + Skill, plus or minus whatever mods the referee wants to pile on.
That's Traveller5. Everything else is commentary.
Everything.