Probably won't get much traction for that here, as this is a site dedicated to official rules systems only for Traveller.
Wrong. The IMTU forum is specifically for all forms of house rules, including other mechanical systems. Hunter has almost never openly discouraged discussions of people's variants.
The restriction is that
Hunter considers attempts to use the MGT SRD to make work-alikes to various official rulesets to be infringement against Marc Miller; that's the only time he's stomped on a conversion discussion.
And no matter what Mongoose preaches, to a large part of the Market, traveller is a setting, not a rules system. (In fact, the complaint I've overheard in my FLGS is that MGT lacks a setting... same people complain similarly about GURPS, but only recently of Hero.)
And the OTU has been ported to no less than 8 discrete systems in 5 families...
The 2d6 Traveller lineage: CT 1st ed, CT 2nd ed, Striker*, MT, MGT**
The GDW House lineage: TNE
the T4 Lineage: T4, T5
The GURPS lineage: GT, GTIW
The Hero Lineage: T4H
The D&D Lineage: T20***
The unofficial conversions:
Peter Newman & I converted it to the WW Storyteller System.
Someone (i know not who) converted it to AD&D 2E †
Someone else converted it to AD&D 1E †
Several people played hybrid Star Frontiers/traveller games, in both directions.
Ty converted to TFT.
There have been 2 comprehensive GURPS conversions prior to the license of SJG. SJG hosted one of them for several years.
There have been a couple of partial conversions to WEG-StarWars (d6 system).
S John Ross has converted it to Risus.
there have been at least two conversions to FUDGE; one is actually based upon Ty's TFT-T
Many GM's ran the OTU using a hybrid of CT and 2300.
*While not an RPG, it's detail level is high enough that people did RP using it sans CT... and MT is essentially an integration of CT and Striker.
** It seems funky, but it's far closer to CT than T4 is. T4 looks very much hybrid between TNE and CT...
† Discussion of these and the the D20 license seemed to trigger Hunter's decision to pursue T20.