diff --git a/.gitignore b/.gitignore
index 485dee6..71940dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 .idea
+scratch-blocks
+scratch-gui
diff --git a/pbt.sh b/pbt.sh
index bba9f74..aee3666 100755
--- a/pbt.sh
+++ b/pbt.sh
@@ -6,37 +6,51 @@ job_start() {
   # [*] job start - [target]:[job]
   # bold
   echo -e "\e[1m[*] job start - $1:$2\e[0m"
-  job_start=$(date +%s)
+  job_start=$(date +%s.%N)
 }
 job_success() {
   # [*] success! [target]:[job] finished in 241.2s :)
-  end=$(date +%s)
-  time=$(( end - job_start ))
+  end=$(date +%s.%N)
+  time=$( echo "$end - $job_start" | bc -l )
   echo -e "\e[1m\e[32m[*] success! $1:$2 finished in $time seconds :)\e[0m"
 }
 job_fail() {
   # [x] FAIL! [target]:[job] failed in 241.2s :(
-  end=$(date +%s)
-  time=$(( end - job_start ))
+  end=$(date +%s.%N)
+  time=$( echo "$end - $job_start" | bc -l )
   echo -e "\e[1m\e[31m[*] FAIL! $1:$2 failed in $time seconds :(\e[0m"
 }
+job_skip() {
+  # [-] skipped - [target]:[job] skipped in 241.2s
+  end=$(date +%s.%N)
+  time=$( echo "$end - $job_start" | bc -l )
+  echo -e "\e[1m\e[34m[-] skipped - $1:$2 skipped after $time seconds\e[0m"
+}
 
 sub_clone() {
   job_start "scratch-blocks" "clone"
-
-  git submodule init
+  if [ -d "$(pwd)/scratch-blocks" ]; then
+    echo "Clone dir already exists"
+    job_skip "scratch-blocks" "clone"
+  else
+    git clone https://github.com/scratchfoundation/scratch-blocks scratch-blocks
+    if [ "$?" != "0" ]; then
+      job_fail "scratch-blocks" "clone"
+      exit 1
+    fi
+    job_success "scratch-blocks" "clone"
+  fi
+  job_start "scratch-blocks" "checkout"
+  pbase=$(<patches/scratch-blocks/PATCH-BASE)
+  echo "Checking out scratch-blocks patchbase $pbase"
+  cd scratch-blocks || exit
+  git checkout "$pbase"
   if [ "$?" != "0" ]; then
-    job_fail "scratch-blocks" "clone"
+    job_fail "scratch-blocks" "checkout"
     exit 1
   fi
-
-  git submodule update
-  if [ "$?" != "0" ]; then
-    job_fail "scratch-blocks" "clone"
-    exit 1
-  fi
-
-  job_success "scratch-blocks" "clone"
+  cd .. || exit
+  job_success "scratch-blocks" "checkout"
 }
 
 sub_patch() {