I have been working on a different ballasting scheme for ME R104 and R88. I've made small sections but I haven't completed a 90 yet because I don't have all the plate for it. The R88 scheme is ok but the R104 holds together very well. Since Bricktracks will soon be producing solid R104 I don't think I'll bother completing it so I thought I'd share without having tested it. If anyone is interested in the LDD file IM me.