ISO layout with a split spacebar

I needed to have an ISO layout and I wanted to have a split spacebar I couldn't find anything ready so i cobbled this together

Layer 0 - BL

standard ISO layout with the addition of the split spacebar menu key (KC_APP) is used to move to the next layer the key in between the two spacebars is the function key

,-----------------------------------------------------------.
| ' | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | = |Backsp |
|-----------------------------------------------------------|
| Tab | q | w | e | r | t | y | u | i | o | p | [ | ] |enter|
|------------------------------------------------------     |
| Caps  | a | s | d | f | g | h | j | k | l | ; | ' | # |   |
|-----------------------------------------------------------|
|Shft| < | z | x | c | v | b | n | m | , | . | / |  Shift   |
|-----------------------------------------------------------|
|Ctrl|Gui |Alt | Space  | FN |  Space  |Alt |Gui | NL |Ctrl |
`-----------------------------------------------------------'

Layer 1 - FL

quite standard function layer arrow keys and mouse movement/buttons on the home row

,-----------------------------------------------------------.
|ESC|F1 |F2 |F3 |F4 |F5 |F6 |F7 |F8 |F9 |F10|F11|F12|  DEL  |
|-----------------------------------------------------------|
|     |   |   |   |   |   |   |   |   |   |prt|   |   |     |
|------------------------------------------------------     |
|       |m l|m d|m u|m r|   |   | l | d | u | r |   |   |   |
|-----------------------------------------------------------|
|    |   |   |   |   |mb1|mb2|   |hm |pgd|pgu|end|          |
|-----------------------------------------------------------|
|    |    |    |        |    |         |    |    |    |     |
`-----------------------------------------------------------'

Layer 2 - NL

numbers numbers numbers... first key (top left) to return to BL menu key (KC_APP) is used to move to the next layer

,-----------------------------------------------------------.
|BL | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 |   |   |       |
|-----------------------------------------------------------|
|     | 4 | 5 | 6 | * | / |   | 4 | 5 | 6 | * | / | ] |     |
|------------------------------------------------------     |
|       | 7 | 8 | 9 | + | - |   | 1 | 2 | 3 | + | - |   |   |
|-----------------------------------------------------------|
|    |   | 0 | , | . | = |   |   | 0 | , | . | = |      |
|-----------------------------------------------------------|
|    |    |    |        |    |         |    |    | RL |     |
`-----------------------------------------------------------'

Layer 3 - BL

all the fancy lights and useful reset button (top right)

,-----------------------------------------------------------.
|BL |   |   |   |   |   |   |   |   |   |   |   |   |Reset  |
|-----------------------------------------------------------|
|     |tog|mod|hui|hud|   |   |sai|sad|vai|vad|   |   |     |
|------------------------------------------------------     |
|       |sta|bre|rai|swi|   |   |sna|kni|gra|xms|   |   |   |
|-----------------------------------------------------------|
|    |   |bd |bt |bi |bs |   |   |   |   |   |   |          |
|-----------------------------------------------------------|
|    |    |    |        |    |         |    |    | BL |     |
`-----------------------------------------------------------'