Updated. Please tell me what other informations you would like to see.

This is nice summary.
It would be good to include some infographic of the system as well.
Below is an infographic I created and posted here:

https://i.imgur.com/IbsbxOr

To be fair, there are several infographic by other users
( paxmao's infographic, ibminer's infographic, 8Habits's infographic, JetSet11's infographic, zentdex's infographic, alia_armelle's infographic )
but in my infographic I tried to make the logic more graphical and intuitive.

Also, it would be informative to include the following table by roslinpl:

Lesson 1: Forum's signature styling rules

I already put a table with signature features, if you want, I can make another table like the one you posted.

Ranks

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Rank	Minimum Activity	Minimum Merit	Signature Limitations	Tag
Brand new	0	0
Newbie	1	0	No styling. No links. Max 50 characters per post.
Jr. Member	30	0	Max 150 characters per post.
Member	60	10	Links allowed. Unlimited characters per post.
Full Member	120	100	Colors allowed. Personal images allowed.
Sr. Member	240	250	Font size allowed.
Hero Member	480	500	Background color allowed.
Legendary	775-1030	1000

_____________
Special Rank	Description	Tag
Legendary	You are guaranteed to become Legendary somewhere between 775 and 1030 activity, but the exact point in this range at which you become Legendary is random per user. Gets 5 gold coins under his name of which the last is half dark blue.
Donator	Manually applied by administration after 10 BTC donation, and gets 5 gold coins under his name of which the last is half green. 5 coins are shown regardless of post count when user is a Donator.
VIP	Manually applied by administration after 50 BTC donation, and gets 5 gold coins under his name of which the last is half purple. 5 coins are shown regardless of post count when user is a VIP.

_____________
Staff Rank	Description	Tag
Moderator	Shown when moderators of specific sections post within those sections. Gets 5 gold coins, of which the last is shown as half faded-out gray.
Global Moderator	Applied to Staff that have moderation privileges in all boards. Gets 5 gold coins, of which the last is half teal colored.
Administrator	Has all available permissions and can appoint moderators and perform other administrative tasks. Gets 5 gold coins, of which the last is shown half red regardless of post count.
Founder	Reserved for Satoshi, gets 5 platinum coins under his name.