I don't know how to spoiler a blockquote, so this looks awful, and I don't know what 16A is supposed to be, but everything else fits:

>!    ................M  
>!    ............MMMCD  
>!    ....MMMX....M...C  
>!    ......X.M.MMMV..C  
>!    ....M.CML.M.C....  
>!    ...MMDV.X.M.MMCM.  
>!    ..M.D..MXCI....M.  
>!    .MMML..C....M..M.  
>!    ..I....M....M??D.  
>!    MCXC..MLIV..M..C.  
>!    .X....C.....D....  
>!    XLIX..M.MMMDIII..  
>!    ......V.....V....