set ggplot plots to have same x-axis width and same space between dot plot rows

by 
library(gridExtra)
library(grid)

gb1 <- ggplot_build(dat1.plot)
gb2 <- ggplot_build(dat2.plot)

# work out how many y breaks for each plot
n1 <- length(gb1$layout$panel_params[[1]]$y.labels)
n2 <- length(gb2$layout$panel_params[[1]]$y.labels)

gA <- ggplot_gtable(gb1)
gB <- ggplot_gtable(gb2)

g <- rbind(gA, gB)

# locate the panels in the gtable layout
panels <- g$layout$t[grepl("panel", g$layout$name)]
# assign new (relative) heights to the panels, based on the number of breaks
g$heights[panels] <- unit(c(n1,n2),"null")

grid.newpage()
grid.draw(g)

enter image description here

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