Starting from the front. There will be a little non-standard stuff here because I have an ARB bumper. The ARB bolts in 6 places to the front cross-member. Two of the places are the standard skid plate mounting holes. In addition there are 4 other bolts, hidden by the stock skidplate. Because of this I have drawn the proposed skidplate with two tabs labeled "a". I'm not sure if these can be bent on your press - if not, we'll just have to cut them off (I don't think I want to remove all 6 bolts to remove the skidplate, but, my mind could be changed).

I want to have the skid plate reinforced with angle-iron, as indicated by the heavy lines in the top view. Ideally I'd like to cut a slot in the web of the angle so that the mounting bolts pass through both the plate and the flat part of the angle remaining. I've tried to indicate that in side and top views.

Dashed lines in top view indicate where bends would be.
The fastener holes shown in top view would go into front cross member, front a-arm brace, and rear a-arm brace to be added.

The rear skid plate would look something like the sketch below

I've shown the angle iron notched to pass over the cross members. The bend in front would be positioned to clear anti-roll bar. The bend in the middle would be positioned to clear driveshaft. This middle bend might be some distance in front of the transfercase crossmember. The bend in the back is just to give it a little ramp effect behind the transfer case cross-member. I can't really provide measurements for this one yet either, since I'm not sure of the dimensions of your  cross-member. Before you bend the actual plate, perhaps we should experiment with some scrap strap to get the shape right? Or we could make a wood pattern (I can't really do this ahead of time, but, could bring the supplies and prep them)

I'm hoping we can do this for about $200 (up from my original estimate...). Obviously I'll help with the fab work...