Not easy, but certainly an interesting block!
Figure 3: Other road blocks
R is for Road to Paradise, perhaps because by the time you finished this block you would be ready for paradise or because you would have to be a saint to piece it! Some blocks are just asking to be pieced using the English paper piecing method of folding fabric over exact paper templates and then joining together with over-sewing and that would be one way of piecing this block. For a modern variation cut the exact size of the pieces from freezer paper and pin to the WS of the fabric. Use the tip of the iron to press the fabric in place along the edge of the template.
Alternatively, if you really want a challenge piece the block by machine using inset seams. Join the two diamonds to the square and add the triangle to create the corner unit. Make four and join to the centre square on point. When sewing inset seams do not stitch into the seam allowance. You may find it helpful to start each seam at the corner of the square and sew to the sides of the block. See Figure 1.
Figure 1: Block piecing and construction diagram
The combination of diamonds and squares creates a 3D effect similar to the tumbling blocks pattern except in this case there is not a smooth progression across the quilt top. See Figure 2. Blocks that have a 3D effect are best placed edge to edge where the full effect can be seen.
Figure 2: Edge to edge layout
Roads obviously played a large part in the history of early American Settlers, as there are many quilt patterns named after roads to different states and towns. Here is a selection of my favourites these all show a strong diagonal pattern that could be used to create a zigzag or diagonal pattern on the quilt top.