When trying out ships in openSP (mainly caps), I can't buy any weapons, with the message that I'm not friendly enough with the faction, even when I set "All factions Friendly" in openSP options.
You never have max rep in Open SP, you have to do a couple missions. You're always a bar short, and I don't mean the one that's impossible to obtain.
A way a lone a last a loved a long the riverrun, past Eve and Adam's, from swerve of shore to bend of bay,
brings us by a commodius vicus of recirculation back to Howth Castle and Environs.
Go grab Ioncross Character Editor.
Open it up, select your character, and move the NPC faction rep to full green.
Voila, all factions are now full green.
You can use the editor to change your weapons, your ships, and most useful, your location.
What I did was go into the M13.ini file where OpenSP settings are.
And changed all reputations to 1.00 (Which, Kurosora, gives you that last unobtainable bar).
You can also use it to change your starting location and money, even your ship (using Ship nicknames) and loadout (which can be found in Ships/Loadouts.ini) when you start a newcharacter in openSP.