Print position and borders on custom package

i have 2 questions related print module

 

1- have searched web , couldn't find indication of precise positioning options cells (photos). when looking @ lrtemplate file, seems position driven "bounds" , parameters agmutablerect looks (x start, y start, x end , y end). units bounds, imageheight , imagewidth in case 72 * inch value (not sure if true). have tried modifying bounds values directly in file , open template in lightroom , worked. question "cellscreenbounds" , "celltemplatescreenbounds" used , parameter values (and units)?

cells = {
       {
        anchored = true,
        bounds = agmutablerect( 85.347767253045, 77.163734776725, 805.34776725304, 797.16373477673 ),
        cellscreenbounds = agmutablerect( 24, 21, 229, 227 ),
        celltemplatescreenbounds = agmutablerect( 5, 5, 55, 54 ),
        imageheight = 720,
        imagewidth = 720,
        page = 1,

 

2- next question is possible have 2 outer borders, 1 thin black , 1 large white -> on white background? when trying lightroom print module, seems photo border same color background color, inner border can have different color. again, have found parameters in lrtemplate file and  agcolor( 1, 1, 1, 1 ) seems white and  agcolor( 0, 0, 0, 1 ), seems black ... knows parameters represent?

    imagebordercolor = agcolor( 1, 1, 1, 1 ),
    innerstrokeborder = true,
    innerstrokecolor = agcolor( 1, 1, 1, 1 ),
    innerstrokewidth = 18.084,
    locktophotoaspectratio = false,
    metadatafontsize = 10,
    numlayoutpages = 1,
    oneimageperpage = true,
    pagebackgroundcolor = agcolor( 0, 0, 0, 1 ),
    pagebackgroundcoloractive = true,

 

 

to give background, i'm trying -> create custom picture package export jpeg print 12x12 photo. on picture package, want place (precise position) few photos overlap, each big white border around photo , thin black border frame photo (so starting center -> photo, big white border, thin black border, white background)

 

thanks

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